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M11 Release Notes

READ THIS Before You Install

The name of the binary executable has changed from apprunner to mozilla on Linux and Win32. The Mac executable is still called apprunner.

If you experience a crash upon launch, delete your Mozilla registry. The format of the Mozilla registry has changed on all platforms since M9.

  • Mac OS: Open your System Folder's Preferences folder, and delete the "Mozilla Registry" file.
  • Windows: Open your Windows directory, and delete "mozregistry.dat".
  • Linux: open your ~/.mozilla directory, and delete the "registry" file.

For more information, please see news://

If you have installed a Seamonkey build prior to August 10, your profile directory contains a "prefs50.js" file. In M9 and all builds after August 10, Mozilla (Apprunner prior to M11) will look for "prefs.js" instead. To use your existing prefs, change the name of the prefs50.js file to prefs.js. If you have no previous profiles, you don't need to make the change.

The file, "msvcirt.dll" must be in your c:/windows directory (Windows only). Install any Netscape 4.x version to obtain this file. (See bug # 19072.)

Install into a clean directory, or delete previous builds before installing. Installing on top of previous milestone builds or released product builds may cause problems. Incompatibilities may be introduced from milestone to milestone while the software is under development.

On Linux systems that use glibc 2.0 (such as RedHat 5.2), there are problems with dl functions (dlopen(), dlsym()) not being thread safe. This might cause your M11 build to randomly crash at startup. If this happens to you, try running the application a few more times. The bits posted on are built on RedHat 6.0, which uses glibc 2.1 and does not have this problem. For more details, see bug 8849.

Do not use Java Plugin 1.3. It doesn't work with the most recent Mozilla builds, and crashes will result. Make sure there are no files named *npjava*.* in either the bin/plugins directory or the NS4.x plugins directory. This problem is being addressed. For more information about this bug, see bug 5369.

Proxies ARE working in this release. See bug 8559 for details on setting up.

Installing the M11 Release Build

Installation Instructions -- Unix

  1. Create a directory named "mozilla" and move the tar.gz file into the mozilla directory.
  2. mkdir mozilla ;
    mv mozilla*.tar.gz mozilla

  3. Change to the mozilla directory and untar the archive. This will create a directory called "package".
  4. cd mozilla ;
    gzip -dc mozilla-i686-pc-linux-gnu-M11.tar.gz | tar -xvf -

  5. Change to the "package" directory.
  6. mv mozilla*.tar.gz ../ ;
    cd package

  7. Run mozilla with the run script:
  8. ./mozilla

Mail Instructions for Unix

You can migrate an existing 4.x profile, or create a new profile and use Account Setup to set up your servers.

Installation Instructions -- Win32

You will need a copy of WinZip. This is shareware available at (also at

  1. Click once on the link. The file will be downloaded to your default folder.

  3. Click on the file to launch WinZip.

  5. After clicking "I Agree" to terms of WinZip shareware, click the Extract button in the WinZip tool bar. An x86 folder with application and associated files will be unzipped.

  7. Select Mozilla from x86 folder to launch the program.

    • Run "mozilla.exe" to use browser and mail.

    • Run "viewer.exe" to run only the gecko layout engine

Note: If you have an existing 5.0 profile as well as unmigrated 4.x profiles, and the command mozilla does not launch seamonkey, use the command mozilla -installer which brings up Profile Manager and allows the user to select a profile.

Mail Instructions for Win32

You can migrate an existing 4.x profile, or create a new profile and use Account Setup to set up your servers.

Installation Instructions -- Mac OS

If you have StuffIt Expander™ installed and your browser is configured to use it:

  1. Click once on the mozilla-mac.sea.bin link. The file will be downloaded to your default folder (usually the desktop) and StuffIt™ will start up and convert it to mozilla-mac.sea for you. Then StuffIt will open up mozilla-mac.sea and convert it to a folder called mozilla-mac for you.

  3. Open the mozilla-mac folder and double-click the file "mozilla." (Note: you no longer need the .bin or .sea files.)

Note: If you try step one and your browser asks you what you want to do it's because you don't have StuffIt™ configured. In that case, just click Save and continue from Step #3 below.

If you do not have StuffIt Expander™ installed or your browser is not properly configured:

  1. Make sure you have StuffIt™ somewhere on your hard drive.

  3. Click and hold the mozilla-mac.sea.bin link.

  5. Choose "Save this link as...".
  6. You will see a file dialog box where you can select where you want to save the file (for example, your Desktop).

    Note: Do not use a slash (/) anywhere in the access path for the Mac installer. Spaces are okay, but avoid other special characters.

  7. Click the Save button.

  9. Double-click on the newly created icon "mozilla-mac.sea.bin".

  11. StuffIt™ will start up and simultaneously create a file "mozilla-mac.sea", and a folder called "mozilla-mac."

  13. Open the mozilla-mac folder and double-click the file "mozilla." (Note: you no longer need the .bin or .sea files.)

Mail Instructions for Macintosh

You can migrate an existing 4.x profile, or create a new profile and use Account Setup to set up your servers.

Uninstalling the M11 Release Build


  • Remove the /package directory where you installed Seamonkey

  • Remove the ~/.mozilla directory, which contains profile information


  • Delete the directory where you installed Seamonkey

  • Delete c:\windows\mozregistry.dat

  • Delete the user profile directory, \users50

Mac OS

  • Remove the the folder Mozilla in the Documents folder

  • Remove the file "Mozilla Registry" in the System Folder | Preferences folder

  • Remove the folder where you installed Seamonkey (probably mozilla-mac-M11)

Files Created or Used

user/ $windir/
prefs.js (Preferences file (used))
cache/ (cache directory)
cookies.txt (cookies file)
*cookperm.txt (used to selectively accept/reject cookies)
FieldSchema.tbl (files for auto form filling)
SchemaConcat.tbl (files for auto form filling)
SchemaValue.tbl (files for auto form filling)
URLFieldSchema.tbl (files for auto form filling)
signons.tbl and signonsx.tbl (logins and passwords file store)
mozregistry.dat (the Mozilla registry)
user/ ~/.mozilla/
prefs.js in ~/.mozilla/[profile] (preferences file (use))
Cache in ~/.mozilla/[profile](cache directory)
cookies (cookies file)
*cookperm (used to selectively accept/reject cookies)
FieldSchema.tbl (files for auto form filling)
SchemaConcat.tbl (files for auto form filling)
SchemaValue.tbl (files for auto form filling)
URLFieldSchema.tbl (files for auto form filling)
signons and signonsx (logins and passwords file store)
registry (the Mozilla registry)
prefs.js in ~/.mozilla/[profile] (preferences file (use))
Cache in ~/.mozilla/[profile](cache directory)
cookies (cookies file)
*cookperm (used to selectively accept/reject cookies)
FieldSchema.tbl (files for auto form filling)
SchemaConcat.tbl (files for auto form filling)
SchemaValue.tbl (files for auto form filling)
URLFieldSchema.tbl (files for auto form filling)
signons and signonsx (logins and passwords file store)
System Folder/Preferences (the Mozilla registry)

*Note:"cookperm.txt" ("cookperm" on Unix) is a file used to selectively accept cookies from certain sites and not from others. It is used only if you set your preferences so you see a warning before accepting cookies. To do that, hand edit the prefs.js file to include:

    user.pref ("network.cookie.rememberAboutCookies", true);

Limited Support Features

Available Navigator Functionality

Functionality Description Comments
Back, Forward, Reload
Location Field You can browse by entering URLs
Various Menu Commands Menus do work, but many commands are not hooked up. These menus and options are working: File menu: New Browser Window, New > Blank Page / Page using Template ... / Page using Draft ..., Quit; Go menu; Bookmarks menu Menu command that aren't hooked up are preceded by a period.
Toolbars Toolbars display above and below content window, most buttons working though a couple are not hooked up to execute a command.
Downloadable chrome You can dynamically change the chrome (apply new skins and new content) in M11 with the following caveats:
(1) Only Navigator is using the new chrome URLs. Messenger hasn't made the switchover yet.
(2) Changes aren't persistent yet, so if you change the skin, the change won't be remembered.
(3) The window doesn't dynamically refresh (once the window manager is further along, it will). In order to see your changes, you need to open up a new window after running the script to set the new skin.
See the sample code in section 9 of the downloadable chrome spec
Link Buttons Buttons that simply link to a web address, including the N brand button, Home, My Netscape.
Access Personal Toolbar Links in Personal Toolbar are displayed and can be used Can't add or edit
Access Bookmarks Access Bookmarks through Bookmarks menu Can load your current bookmarks
file. See instructions under platform installations.
Access via Manage
Bookmarks Window
Can open, close, and sort folders.
Status Display Toolbar beneath content area, status during loading of URLs.

Available Mail/News Functionality

Functionality Description
Start Mail Run Mozilla and bring up the three-pane mail window
Get New Mail Download and display contents of local mail folders; POP
Handle SMTP SMTP protocol works; send a message (note: on send, the compose message window doesn't close)
Display Message -- Mail Go to the "demos" menu and select several messages from your Inbox. The message content is displayed in the message (lower right) pane.
Display Folder List Local mail folders are displayed in the folder (left-hand) pane.
Delete Message Delete a message using the Delete toolbar button.
Edit/Send Text Message Bring up the compose window by clicking the New Msg button, type some text, and send.
Sorting -- Thread Pane Sorting works for Subject, Sender, Status, and Date.
Move/Copy Messages You can move one message at a time.
Read Attachments in Messages Attachments can be displayed in the message pane.
Post message to newsgroup Using the compose window, post a message to a newsgroup. To post to hosts other than, set the "network.hosts.nntp_server" preference (the default NNTP server preference). Currently, the default value of this preference is "".
Post to multiple newsgroups simultaneously In the "Newsgroup:" field of the compose window, you can post to multiple newsgroups at once. Use commas to separate the newsgroups.
Display news hosts and subscribed newsgroups Using the prefs and the newsrc files (and if needed, the fat or NewsFAT files), populate the folder pane with news hosts and subscribed newsgroups.
Display News articles in thread pane When you click on a newsgroup, show the message subject, date, etc. in the thread pane.
Display Message -- News Click on a message in the thread pane and the message content is displayed in the message pane.
Get News Select a newsgroup in the folder pane and click on "Get Msg" to download any new news articles.
Marking news message as read Use the menu "Message | Mark | As Read" to mark a news message as read.
Currently, the read status is being saved, but not in the newsrc file. This is a bug. (#8075)
Viewing news message automatically marks it read Viewing a news message marks it read
Currently, the read status is being saved, but not in the newsrc file. This is a bug. (#8075)
Cancel news message If you are the author of an article, then the delete button (or the Edit | Delete Message menu item) cancels the article. As with 4.x, you can only cancel one article at a time.

Due to several dialog / alert bugs, you won't see the confirmation dialog ("are you sure you want to do this?") or the alert open cancellation. ("message cancelled."). For now, On Windows and UNIX, look for these messages in the console window.

Address Book The Personal Address Book is displayed in the left pane. LDAP and additional address books are not working yet.

Additional Mail Functionality

  • The multiple POP accounts feature is available for you to try out. To set up multiple POP accounts, open the mail application and use the Account wizard. You will need to have identity and server information for the second account.
  • You can use the Address Book window and the Select Address dialog. The Personal Address Book is working for adding cards, editing cards, and deleting cards. LDAP and additional address books are not working yet. The data is stored in a file called "abook.mab". Your Address Book information is used to auto-complete names entered into the mail compose window.

Available Editor Functionality

Functionality Description
Maximize/Minimize Box
Collapase/Expand/Zoom box (Mac)
All function.
Apply/Remove bold, italic, underline Applies style, doesn't remove.
Apply/Remove Listing Functions.
Indent/Outdent Functions.
Apply font, font size, font color All function.
Insert Link Opens the Insert Link dialog
Insert Image Opens the Insert Image dialog.
Insert Anchor Functions.
Insert horizontal line Functions.
Spell Check Opens the Spell Check dialog on Windows; does not function on Mac OS and Linux. (bug 6864)
Up/Down arrows Function.
Left/Right arrows Works correctly.
File menu New, Open, Save, Save As, and Quit work correctly. PrintSetup, Print Preview, and Print are not functional. (bugs 11767 and 10664)
Edit menu Undo, Redo, Cut, Copy, Paste, Select All, and Find work do not work within the browser. You can, however, cut, copy, and paste within text fields by using keyboard shortcuts. Clear and Find Again are not functional.
View menu Hide Composition Toolbar and Hide Format Toolbar are not functional. (bug 11770)
Insert menu Link, Image, Horizontal Line, Table, HTML Tag, Line Break, and Break Below Images work correctly. Target is not functional. (bug 11771)
Format menu Font options, size, style, and color work correctly. Paragraph options work correctly.
Tools menu Spell Check option opens the Spell Check dialog on Windows; does not function on Mac OS and Linux. (bug 6864)

Available Gecko Functionality

Functionality Description Comments
HTML 4.0 Done except bugs.
Cascading Style Sheets, level 1 (CSS1) Features 98% done; bug-fixing remains.
Cascading Style Sheets, level 2 (CSS2) Positioning, tables, selectors done. No support is committed for final release, but some features are already working and will likely be enabled.
Document Object Model (DOM) Level 0 Done.
Document Object Model (DOM) Level 1 HTML 90% done.
Document Object Model (DOM) Level 2 JavaScript event model 80% done.
Extensible Markup Language (XML) James Clark expat parser in; documents parse.
Simple XLink and HTML Namespaces done.
XML + CSS1 Working.

Known Issues

General Browser Issues

  • If you experience a crash on start up after migrating your profile, try deleting your bookmarks.html file in your users50 directory. The application may have problems reading some 4.x bookmarks files. (bug 18384)

  • Clicking the Back or Forward buttons while pages are loading may cause the browser to quit. (bug 17932)

  • A crash may occur if you print from Mozilla and then reload the page. (bug 12023)

  • (Linux only) In 256 colors, loading the test10.html document in Mozilla will cause a crash. (bug 11090)

  • Loading problems (possible crash or freeze) sometimes occur on pages that contain applets.

  • The page and its secondary sites may not load correctly.

  • Clicking the Back button from a named anchor will not work unless you click twice. The reference page will be skipped. (bug 15441)

  • The Back button menu does not always list previously visited URLs. (bug 17430)

  • Gfx Scroll bar problems: You may experience problems with autoscrolling, text fields, and text the exceeds control width. (bugs 13407, 17989, and 18353)

  • You can't connect to secure sites (URLs beginning with "https://") in the M11 release.

  • FTP is not fully functional in M11. (bug 10737)

  • The Stop button fails intermittently

  • Print (toolbar button & menu item) and Print Preview fail intermittently

  • Keyboard shortcuts/command keys are not available for most menu items with the exception of the following for the mail compose and editor window: Ctrl-C (copy), Ctrl-V (paste), Ctrl-Z (undo). and Ctrl-Y(redo) and their Mac OS equivalents. The old Unix equivalents (using Alt- instead of Ctrl-) don't work; use Ctrl- .

  • Within Viewer, many options within the Debug & Tools menu items are not currently working or produce unpredictable results.

  • Windows only:

    • Links on pages that use CSS do not work.

    • If you have a second video display monitor connected to your computer, links displayed on that monitor will not work.

    • Selecting the Print option causes crashes.

    • Solaris only:

      • The Copy command in the browser's Edit menu is not working. (bug 6253)

  • Mac OS and Linux only:

    • Selecting within menus and dialog boxes doesn't always work. If you can't select using the mouse, use the arrow keys instead. (bugs 14131 and 15476)


Issues with Bookmarks and History

  • Incorrect bookmark behavior can be related to profile problems. See Issues With Profiles.

  • Drag and drop is not yet implemented, but you can use cut, copy, and paste to manipulate your bookmarks.

Sidebar Issues

  • To hide the Sidebar, select Sidebar from the View menu. Hiding the Sidebar works only for the ucrrent window -- new windows will open with the Sidebar showing. (bug 16516)

Issues With Profiles

  • IMPORTANT: All the information regarding profiles is stored in the registry file. The registry file gets created even if you have used earlier versions of Mozilla (Apprunner). When you check out a new build, make sure you delete or rename the following items before you install, build, and run the new executable:

    • Windows mozregistry.dat ( c:\winnt or c:\windows or equivalent),
    • Mac OS Mozilla Registry (System Folder:Preferences),
    • Linux registry (~/.mozilla/)

  • You open Profile Manager with the command line argument : -ProfileManager. The Profile Manager user interface appears, supporting creating a new profile, and deleting and renaming existing profiles. When you finish any of the tasks you can click Exit to quit the Profile Manager. You can click a Start Communicator button to start Mozilla with a selected profile. Also, users can migrate 4.5 Communicator profiles (Windows only, for now).

  • Various command line options to create and manage profiles are:
  • # mozilla -P <Profilename>
    Runs Mozilla with the <Profilename>.
    # mozilla -CreateProfile "<Profilename> <ProfileDir>"
    Creates a profile (i.e., <Profilename>) and creates a directory at the specified location i.e., <Profiledir> and launches Mozilla.
    # mozilla -CreateProfile <Profilename>
    Creates a profile and creates a profile directory under default profile location.
    # mozilla -ProfileWizard
    Launches the Create Profile Wizard to create a new profile. The Create Profile Wizard lets users create a new profile at the default location or the location of their choice. At the end of the process a profile is created and marked as the current profile, and Mozilla is launched with that profile. The wizard is currently just two screens. Mail and News related preferences/information will be collected by a different application.
    # mozilla -ProfileManager
    Brings up Profile Manager for managing profiles. Users can select a profile and click on the Start Communicator button to launch Mozilla with the chosen profile. The current profile (usually the last used profile) appears preselected.
    # mozilla
    Several scenarios:
     number of profiles = 0 --> Brings up Create Profile Wizard
     number of profiles = 1 --> Launches Mozilla directly with that profile
     number of profiles > 1 --> Brings up Profile Manager

    Default profile locations for profile directories are <3 levels up from the exe location>\Users50, on Windows :Documents:Mozilla:Users50: on Mac OS, and ~/.mozilla on Linux.

  • Profile Manager (Windows and Linux only): The Rename and Delete buttons are not working properly.

  • Profile Migration (on Windows only): 4.5 profiles now can be migrated to 5.0. In the process of migration, 4.5 profile information is undisturbed. In 5.0 the new location for the migrated profiles is the default location as mentioned in the above paragraph. Migration is functional on Windows only, but will soon be extended to the Mac OS. (A date for Linux availability is currently unknown.)
  • To migrate 4.5 profiles, run Mozilla with the command line option -installer. The profile to be migrated is listed as <profilename> - migrate in the Profile Manager's list box. Users can select a profile to be migrated and click on the Migrate button. If the migration is done successfully, the suffix ' - migrate' disappears in the display, marking that profile as a 5.0 profile. Currently, only the prefs.js file and mail and news folders are copied in the migration process. Users cannot rename or start Communicator with a profile that must be migrated. With the changes that went in at the end of M7, it is required to create a 5.0 profile before using the migration service. This will be fixed in M8 (so that there is no dependency on having a 5.0 profile).

  • If the Bookmarks menu has only the Add Current Page and Manage Bookmarks menu items, and they are not followed by a list of bookmarks, then bookmarking will not work correctly until you do one of the following:

    • Migrate an old 4.x profile over to Seamonkey, or

    • Create a new profile by following these steps:

      1. Remove your current profiles and mozregistry.

      3. For Windows, remove the "mozregistry.dat" file in your Windows (or winnt) directory; also remove the entire "Users50" directory.

      5. For Mac OS, remove the "Mozilla Registry" file from your Preferences folder (System Folder|Preferences|Mozilla Registry). Then remove the "Users50" folder from the Documents folder that was placed on your hard drive when you installed Seamonkey (documents|mozilla|Users50).

      7. For Linux, remove the .mozilla/ directory.

      9. Launch Seamonkey and create your new profile. The menus should now appear and behave normally.

      (See also bug 9505)

Editor Issues

  • A number of keyboard accelerators may not work, particularly those contained in the File menu. (bug 13378)

  • Find doesn't work. (bug 11425)

  • The editor doesn't launch on the Mac OS unless you give the browser the focus. (bug 9701)

  • Mozilla crashes on launch at times. (bug 8849)

  • Preview is not working. (bug 9200)

  • The image dialog is not fully implemented. (bugs 9751, 9753, 9754, and 9755)

  • The menu and toolbar items don't get disabled. (bug 5563)

  • There are some missing menu items. (bug 14342)

  • Table editing needs to be implemented. (bug 6256)

  • You must click in a document in order for the caret to reappear.
  • (bug 9701)
  • Mac OS and Linux: The spellcheck dialog does not come up. (bug 6864)

  • Mac OS only: The editor doesn't launch. (bug 9701)

  • Mac OS only: Toolbar buttons do not appear until mouseover. (bug 13438)

  • Linux (Solaris) only: Highlighting doesn't work. (bug 10699)

  • Linux only: Mozilla may crash on launch. (bug 8849)

  • Linux (Solaris) only: Highlighting doesn't work. (bug 10699)

Java Issues

  • If you have installed the latest JRE 1.2 from Sun Microsystems, you may crash at startup if the Java plugin is present. To fix this, remove the following dlls from the Plugins folder located in your 4.5 (or later) Communicator directory: npjava32.dll, npjava12.dll and npjava11.dll.

  • On Linux, Java is not yet implemented.

Javascript Issues

  • document.write fails to write HTML tags and any text written before the last tag. (bug 11141)

  • JavaScript alert dialogs are not being displayed. (bug 4279)

  • None of the JavaScript functions work with Mozilla windows. Windows can be opened using the ToolkitCore, but those windows don't play well with most of the JavaScript properties and methods.

Issues With Small Fonts on Linux

  • If the fonts are too small in your environment, it may be possible to alleviate this by setting a preference in Mozilla. Add a line like the following to the preferences file (~/.mozilla/prefs.js):

  •  user_pref("browser.screen_resolution", 120);

    This sets the dpi to 120. If you set the pref to zero (0), Mozilla will use the X server's dpi value. If the pref is not set, it uses the default value of 96.

    There is some info about setting the X server's DPI value at

    If your fonts are still too small (or too large) after setting the DPI correctly, you can adjust the font size as follows:


    Note that the latter only affects fonts. The screen_resolution preference affects anything that specifies absolute size (e.g. CSS "pt" points).

Known Issues in Mail and News

  • Account setup issues:
    • Be sure to fill in the incoming server field when setting up a new account. Otherwise, a crash may occur when you finish the Account Setup dialog. (bug 18075)

    • After you create a new profile, when you set up additional IMAP accounts, the folder pane may not show your new account until you exit and restart the application. (bug 18239)

    • In the Account Settings dialog box, the left pane is blank. (bug 17702)

    • When you create an account using the account wizard, there is no visual feedback when choosing the type of server. If you select "IMAP Server" or "News Server" the combo box will not display the new server type, but it does remember what you have selected.
    • Linux and Mac OS only: When you create an account using the account wizard, if you can't use the mouse to select a server, use the Up and Down arrows instead.
  • The behavior of adding local mail folders has changed for migrated POP profiles and new profiles. Local mail folders are now added only for IMAP; one local mail folder per profile. (bug 18064)

  • The Rename option in the File menu does not work when renaming a folder in a POP account. (bug 17765)

  • If you reply to a message and close the window without typing any content into the message body, the application may crash. Workaround: type something into the body of the message before closing the window. (bug 17937)

  • Printing mail only prints the message body, not the headers. (bug 12505)

  • When you print from the Mail and News compose window, the top half of the first line does not print. The rest of the document prints correctly. (bug 18083)

  • The address book list in the left pane of the address book shows up in duplicate. (bug 17680)

  • Don't use the address picker to address a message to more than one recipient. If you do, the message will not be sent. Enter the recipients' names directly into the recipient field. (bug 17931)

  • Expanding and collapsing newsgroup folders is not working. (bug 18675)

  • Cancelling a news message doesn't remove it from thread pane. (bug 8216)

  • When using the Address Picker, Cc and Bcc choices are not properly displayed (bugs 14722 and 18642)

  • "Send Later" fails when there is no local mail folder hierarchy. (bug 18260)

  • You may be unable to read messages generated by Outlook2k and Word 9. (bug 14905)

  • Collapsing the addressing pane in the mail compose window may result in a crash. As a workaround, do not collapse the addressing pane. (bug 11856)

  • Currently, the Delete key does not delete messages. Choose Delete from the Edit menu, or use the Delete toolbar button to delete messages.(bug 8985)

  • When addressing a message to multiple recipients, use a comma to separate the recipients. If you use a semicolon, a program crash may occur.(bug 8276)

  • Although you can bring up the Search and Filters dialogs, backend code for these features has not been implemented so you will not be able to perform any functions in these dialogs.

  • When you select an unread message with the message pane collapsed, the message is marked as read. (bug 6485)

  • If you have local folders with more than 1,000 messages, don't point the Mail application at your actual local folder hierarchy. Larger folders may take too long to load and may consume vast amounts of memory.

  • Vcards in mail are not fully functional and may cause failures when clicked.

  • Mac OS only:

    • If you add a card to the address book, and then compose a message, the new card is not used for autocompleting the recipient field. Workaround: Close and re-open the application. (bug 18629)

    • After startup, you must click inside the browser window to bring it to the front before using any of the menus. (bug 9701)

  • Linux only:

    • Text under the toolbar buttons is not readable. For a workaround, see

    • Opening a modal window on top of another modal window leaves a blank window on the screen. Close it using the close box. (bug 16310)

    • Closing the Account Settings dialog causes a gray or blank box to appear. (bug 18458)

    • Scrolling to view mail folders may cause a crash. (bug 16929)

  • Issues in the Mail Compose window:

    • Mac OS only: When you reply to a message, you must resize the compose window to see the address and body. (bug 18971)

    • Keyboard shortcuts don't work.

    • The cursor does not appear in the message field until you begin typing.

    • The received message does not wrap lines, so you may want to embed hard returns in your messages.

    • Messages may contain either too much vertical white space or not enough.

    • If you are using plain text (instead of HTML) for messages, you may need to press Enter twice at the end of a line to move the cursor to the next line.

    • To use the plain text compose window, add this line to your preference file:


      user_pref("mail.identity.id1.send_html", false);

International Issues

For updated information on features, fonts, and testing for Internationalization, visit this page.

I18n Engineering and Milestone Tasks document is available here.
I18n Beta 1 Feature Plan is available here.
I18n Beta 1 Mail/News Functional specifications are available here.
Localizing Mozilla document.
Bitstream Cyberbit Unicode font for Windows  (version 2.0) is available here. Read READMEFirst file for details before downloading the fonts.
Report international bugs: Use Bugzilla.
Questions and comments:
    Note: The name of the executable has changed from apprunner to mozilla.
  • There is now very little need to directly edit Preferences file, prefs.js.  Both profile migration and new profile creation are now very easy to accomplish with the improved Profile Manager. Users who have had trouble setting up Mail server(s) before should try Profile Manager.
  • Mozilla can migrate any Communicator 4.x profiles you have on your system. Choose an existing one from 4.x and a new one will be created for Mozilla.
    • The window for profile migration will appear the first time you start M11 build after the installation.
    • If it does not, you can start with the profile manager: mozilla -installer (Unix & Win).  Mac users can start with the Mozilla Profile Manager file.
    • Important Note: If you run Profile Manager and exit without selecting any profile, you may have a problem starting Mozilla thereafter. This seems to be a bug. In such case, run the Profile Manager again and select a profile. After this, you will not have the problem.
  • If you have used an earlier version of Mozilla, we recommend that you delete the file called mozregistry.dat (Win)/Mozilla registry (Mac)/registry (Unix) before you run M11 Mozilla. (Don't delete Netscape Registry file for Mac, which is for Communicator 4.x.). We recommend this procedure because during an earlier Milestone, i.e. M10, there has been a change in the way registry works and the old registry prior to M9 will not work well with builds later than M9. Read the section in the Release Notes called Files Used or Created to find out where you can find these files.
  • When you start M11 after having deleted mozregistry.dat or registry, you will be asked to create a new profile. If you name an existing profile, that profile will be used. Otherwise "Default" profile called "mozProfile" will be created. If this latter happens, you can replace the prefs.js file in the Default folder with the one from an existing profile directory. (Note that the default profile name changed from prefs50.js (of M8 and earlier) to prefs.js starting with M9.)
  • Also read the Installation instructions for your platform carefully in this Release Notes.
  • There have been a number of  improvements made since M10 in stability and features that matter to international users. M11 is now closer to a browser usable on a daily basis.
  • GFX widget/Ender is ON by default and thus requires no special setting in the prefs.js as was reported for M9. This means that all input areas in M11 support non-ASCII character input including input using CJK IMEs. Editor bugs reported for M10 have been mostly fixed in M11. Thus users should have usable Editor on all platforms.  Read the Editor section below for more information.
  • M11 converter(s): There are no new converters in M11.  See here for a list of all the converters at M11.
    • Unix charset testing:  As mentioned in the M7 Release Notes, the display for the supported charsets except Armenian, Thai, and Vietnamese should be working now.  We would like users to continue to look at various Unix charsets and file a bug if a problem is found. The list of the supported charsets at M11 can be found below. Please download the Unix binary and check out our support for these character sets. (Note: You need appropriate fonts to display these languages -- pcf.gz format on Linux. Visit this site for ISO and Cyrillic BDF fonts, and this site for multi-byte language fonts. For converting from BDF to PCF format fonts, use bdftopcf utility.)
  • View | Character Set menu:
    • Note: The current Character Set menus (including the name of the menu itself) are temporary and will be replaced eventually an entirely new single menu. The new menu specs will be published soon. The name "Character Set" will also be replaced by a new name.
    • You will notice that there are 7 Character Set Menus in the Browser window, and 6 in Composer/Editor and Messenger.
    • The first 6 "static" menus with sub-titles such as "ISO" constitute a workaround for long, non-customizable and non-scrollable menu.
    • The 7th Character Set menu -- found only in the Browser window -- is the dynamic menu which is under development but will eventually replace the workaround menu. This is the same menu as the first 6 put together. It does not scroll under Linux and Windows and so you cannot probably see the whole list except on Mac, but the dynamic menu is created via a script. This is first of the series of steps we will be taking to make the Character Set menu completely dynamic and eventually accommodate new Character sets via a plug-in directory. The dynamic Character set menu will use the Extensibility Model as discussed in this document.
    • Both types of  menus work in M11 and one of them is actually redundant. This is harmless, however. Character set menus in other components are still static at this point and you will not see the dynamic menu.
    • View | Character Set menu Display problem workaround: The workaround mentioned in M10 and earlier Release Notes has been incorporated into M11 and thus is no longer necessary.
  • View | Character Set menu usage:
    • You can switch to different Character set upon encountering a page which does not have a  meta charset tag and which is not displaying correctly. If you happen to have a charset detector ON and if the display is failing, you need to first turn OFF the detector setting, and then try the Character Set menu. Otherwise, the charset detector's choice will always predominate over the manual menu selection. You will not see a checkmark next to the menu item yet, however.
  • Charset detection modules in the Browser Menu.
    • The charset detection modules for Chinese, Japanese, Korean, East Asian (CJK), Chinese (Simplified & Traditional Chinese), Ukrainian, and Russian are in a menu below the Character Set menu. (Note: At present, there are a few bugs for Ukrainian and Russian modules from working. There is also a bad bug which prevents any character input by Editor once either of these auto-detect modules is turned on. We recommend against this using these 2 modules until these bugs are fixed.)
    • You can select 1 charset detection module at a time. Once selected, the auto detection for the charsets of  language(s) you selected will be ON until you turn it OFF.
    • The charset detector will be engaged even when you have selected a Character Set explicitly via the Character Set menu. If you need to override the effect of the charset detector in effect, choose OFF, and then select a new Character Set from the Character Set menu. Please use the charset detector feature for a variety of web pages in the languages of your choice and let us know how we are doing. File a bug at Bugzilla or send your comments to netscape.public.mozilla.i18n or
    • Until M10, these charset detectors could be used only by prefs.js settings. This is no longer necessary since the charset detector menu fulfills exactly the same function.  The menu now controls what gets inserted into chardet_name of:
      user_pref("intl.charset.detector", "chardet_name");
      If the charset detector is OFF, then chardet_name value will be empty. As reported before, unit testing also can be done via a utility called "Detectch.exe" found in the same directory as the "mozilla.exe" file. If you are interested in modifying the prefs.js for charset detector modules or use the command line utility, read the usage instruction here.
  • HTTP charset: Mozilla supports server-generated HTTP charset correctly. (The order of priority is: HTTP charset > Document Meta Charset > Browser Menu choice.)
  • View | Page Source: works only partially for different charsets.
    • It seems to work OK:
      • if the page has a correct HTTP charset associated with it
    • In other cases, there are some reported failures of correct display or non-loading. They fall under 3 types of cases:
      • The page has a document-based meta charset tag --> may not load the source view or may load the page itself again rather than the source of that page. (The latter has been reported for Linux. Both bugs were fixed in M12.)
      • The page has been correctly loaded with the use of a charset detector --> the source view will load but may not correctly display characters.
      • When none of the conditions above holds and the user has loaded the page correctly with the manual change of the Character Set menu --> the source view will load but may not correctly display characters.
  • CJK line breaking: Mozilla's line breaking implements specifications found in JIS X 4501 with some additional modifications. Read this news article posted to the newsgroup netscape.public.mozilla.i18n by Frank Tang for details.
  • CJK basic printing: should be working on M11 on Windows. Not verified to be working on Linux -- probably not.
  • EUC-TW bug: M10 had a bug which produces wrong display for EUC-TW (Traditional Chinese) pages. This problem has been fixed.
  • Mac: Baltic display:
    • ISO-8859-13: You may experience a problem in Baltic ISO-8859-13 display in that some of the uppercase characters may be missing the diacritical marks above them showing only the base characters.  See Bug 9165.
      • One Workaround:
        • 1) Install a Central European script bundle (CE) from this Apple file. (You need DiskCopy utility to mount this image). After you mount this disk image, rather than using the Installer, open the System file directory by double-clicking on it. In it, you will find among others, CE (script), Slovak (keyboard layout), and slovensk (keyboard layout). Drag these files to your current System Folder. Mac OS will then place them in the right places.
        • 2) Next, get the fonts for Central European from this Apple file. Once you mount this image file with DiskCopy, you will find a number of CE fonts. Drag and drop them onto your System Folder. Mac OS will then place them in an appropriate folder.
        • 3) After steps 1 and 2 are completed, re-start your Mac. You should now see ISO-8859-13 (also ISO-8859-4) characters correctly.
    • Central European ISO-8859-2 display: There seems to be a Mac bug -- some 8-bit range characters display as "?" even though a correct font exists on the system.
  • Java: Java Plug-ins work OK on Windows.
    • To get Java working on Mozilla, you need to take some extra steps as described below.
      • First get the JRE 1.2.2 or later from Javasoft. (JRE package may be included in Mozilla distribution also.) Install the package on your Windows. We find that JRE 1.3 Beta can run more applets than JRE 1.2.2 plugin files and are therefore recommended. Plugin files are also much smaller in size in the latter version.
      • Create a directory named plugins in the same directory where the mozilla.exe resides.
      • Copy 3 files, npjava11.dll, npjava12.dll, and npjava13.dll, from the JRE's bin directory into the plugins directory you created in step 2.
      • Check the Java Plug-in Control Panel from Windows Start | Program menu. The following settings (no others) must be checked.
        • Basic: Java Plugin, Java Console (optional), Cache Jar in memory
        • Detailed/Advanced: Use Java Plugin as default, Just in time Compiler is on
        • Proxy: use the browser setting
        • Certificates: (none)
    • Due to a few bugs, some applets simply will not run. Some string display applets do run and so far we have found none can actually display non-ASCII strings. If you have specific applets which deal with string display, write your finding to
Editor: For IME specifications, see this document by Tague Griffith.
  • Note: There have been many small fixes made in M11 to make editing easier for the user. The user will find editing tasks generally easier with M11.
  • CJK IME: All major bugs present in M10 have been fixed.
  • Basic IME support on Unix: We test Japanese input under Red Hat 6.0 + kinput2 + wnn4. We need your help on testing other Unix platforms and other language IMEs!
    • Good news!: Almost all major Unix IME-related bugs observed in M10 have been fixed in M11.
  • Help test (Japanese) IME on Unix!: We need the following kinds of testing for Japanese IME  and others on Unix. Please send your comments to netscape.public.mozilla.i18n or file a bug using Bugzilla Bug Management System for Mozilla.
    • Testing on other platforms -- our reference platform was Red Hat 6.0.
    • Testing other XIM-based Japanese IMEs (both public domain and commercial ones such as Wnn6+xwnmo) to see how we are doing. We used kinput2 + wnn4 as our testing environment. We need input from people using other IMEs and servers. Write to us also if you can confirm other IMEs are working. If there are special conditions to be followed, include that information also.
    • We would also like to hear from users of IMEs for Chinese and Korean. Write to: netscape.public.mozilla.i18n about your findings.
      • So far we have received reports that XCIN for Traditional Chinese works with Mozilla. Also internally we could get one Korean IME to work. We will publish further info in the future about these IMEs.
  • IME bugs -- you should know the following to use IMEs effectively.
    • On all platforms:
      • The crashing bug, which was caused by the user inputting characters via IME without any ASCII characters first, has been fixed.
    • On Unix:  Although the crashing bugs have been fixed, there are a few annoying bugs still remaining. Unix IME is by no means in a great shape yet but it is generally usable in M11. You need to be aware of  the following bugs for Unix IME.
      • The over-the-spot position of the input area is not well-aligned when you first start inputting character. It is positioned above the top edge of the current window. You will not see the characters well until the first input has been committed. Once the initial string has been committed, the next input process brings down the IME input area to the visible position.
      • With kinput2, we noticed a bug in which the input module window often covers the input line. You can move the window if this bothers you.
  • Form Password field input bug:
    • Due to a bug, the form password input is not concealed when you engage CJK IMEs. To avoid this bug, turn off the IME and then input a password. Only this mode will work OK for the password field. The Half-width Alphanumeric mode (e.g. Japanese IME) normally works like the direct input mode but for this bug, it is not effective and reveals the password input as you enter characters.
  • Copy/paste in Non-ASCII strings: Basic intra-application copy/paste is now working for non-ASCII strings. Improvements are expected in M12. (Most of the intra-application copy/paste bugs have been fixed in M12. The inter-application copy/paste is working partially in M12 -- a full fix is scheduled for M13.)
    • You can copy/cut and paste within the same application
      • within the same same text area
      • from one text area to another text area (e.g. from HTML to Plain Text editor text area)
      • from one text field to another text area under HTML Mail Composer (e.g. from Mail compose subject header to body text area)
    • Known bugs: Copy/cut and paste for non-ASCII string  is not working in the following areas
      • from one application to another
      • from one text area to another text field (e.g. Mail compose text area to the subject field)
      • from one text field to another (e.g. from subject field to the "To" " field.)
      • within the same text field (e.g. copy a string in Browser location window and paste into another position in the same location window.)
  • Saving with Editor Character Set menu: On a new document, change the encoding to the one you would like to save the document in and then use the File | Save as  menu to save the edited document in that character set. Bugs or comments to: Bugzilla or Here are some known bugs.
    • With M11, all documents are saved into UTF-8 and the menu change is not observed for saving. This is a bug and will be fixed in near future.
    • Currently this menu does not reload a document. It can only be used to save a document into a different charset at the save time. This menu will be re-worked extensively later.
    • There is a bug in that when the same-named document is saved, the new document not replace the old one.
  • Notable bug fixes:
    • Korean IME now works on Mac.
    • Keyboard switching for various international keyboards should work now
    • Selected IME text is now replaced properly.
    • AltGR key now works enabling some keyboard users to input "@".
    • CJK character deletion in form now works OK.
  • Summary of what has been enabled up to M 11:
    • CJK IMEs on Windows and Mac.
    • IME on Unix enabled. (Known to work for Japanese and Traditional Chinese (e.g. XCN). Other languages not tested yet.)
    • Keyboard support for many one-byte languages on Windows: Please file a bug if you find a problem in your language or keyboard.
    • Keyboard support for many one-byte languages on Mac: Roman Australian,  Brazilian, British, Canadian-CSA, Canadian-ISO, Canadian-French, Dutch, dv-Dvorak, dq-Dvorak-Qwerty, Finnish, Flemish, French, French-numerical, German, Italian, Norwegian, Spanish, Spanish-ISO, Swedish, Swiss French, Swiss German, Cyrillic Bulgarian, Cyrillic-Qwerty, Russian, Ukrainian.
  • Localization framework:
    • We have published a guideline for localization. Anyone interested in localizing Mozilla into a native language should read this document carefully.
    • Here are some basic ideas to keep in mind when localizing Mozilla.
      • Do not localize .xul files directly. All localizations must take place in corresponding  .dtd files or property files.
      • Most localizable strings have now been extracted from .xul into .dtd (or property files) files. The .dtd files are found under  ../chrome/component_name/locale/en-US directory. They match the names of the corresponding .xul files which are placed under:../chrome/component_name/content/default directory.  (Note: Some samples of property files, which can also be localized, are found under ../res directory but there are currently only a few examples of this type of files.)
      • If you create a .xul file then you need to extract localizable string into a corresponding  .dtd file. (If you're creating Mozilla UI via a script rather than by a static .xul file, then you need to extract them into a property file.) To extract .XUL entities into DTD files for localization, read this document.
      • XUL/XML/RDF files assume the default charset to be in UTF-8. If you change UI strings to your favorite language, they should show OK as long as the localized files use UTF-8 charset. (You can change menus to Japanese, for example, in file using the method suggested above and then convert the DTD file to UTF-8.) The menu items generally cannot be in languages your system does not support, e.g.  no Japanese menu for US Windows is possible at the moment.
      • All non-ASCII .dtd and .property files must be in UTF-8 encoding, which is Mozilla's default encoding for resource files. You do not need to explicitly mark the resource files with this encoding, Mozilla will assume that they are in UTF-8 if there are no charset tags.
      • UTF-8 conversion utility:
        • Use convenient converter utilities such as "uniconv" (for Windows and Unix) or "native2ascii" utility included in the latest JDK.
        • Mozilla's nsconv conversion utility has been enhanced by ""-- it now supports charset aliases: The original nsconv is by the courtesy of Frank Tang. nsconv is installed in the same directory as your mozilla executable. You can use any encoding names recognizable by Mozilla and their aliases checked into the source in using this utility. Here's the basic command line for using this utility:
          • Usage schema --any one of the following:
            • nsconv -f source_charsetname -t target_charsetname source_filename new_filename
            • nsconv -f source_charsetname -t target_charsetname source_filename > new_filename
            • nsconv -f source_charsetname -t target_charsetname < source_filename > new_filename
          • You can use the charset names you see within the parentheses of  the Character Set menu for source_charsetname and target_charsetname, e.g. iso-8859-1, Shift_JIS, Big5, EUC-KR, etc.
  • DTD/XML encoding definition supported -- thus  you can use charsets other than UTF-8 as the resource file charset, but using charset other than UTF-8 is not recommended for Mozilla localization. We assume UTF-8 as default. Cf. Bug 4431.

Mail/News (Testing done on Windows and Linux only):

  • Preferences file: prefs.js (Note: Up to M8, the Preferences file was named prefs50.js. This file name must be prefs.js instead for all later Milestones.)
    • Preferences changes for M11:
      • The greatest beneficiary of the M11 fixes in Preferences and Profile Manager is the Mail user. IMAP and POP mail and News servers settings can be done via UI now and messages/articles download rather easily. Read this section also in addition to looking at Mail specific preferences.
      • If you have been hesitating to use Mozilla Mail and News, M11 offers very good reason to start using them. It's very easy to set up. Just use Edit | Account Setup ... menu!
    • SMTP sever setting:
      • If you have not done so already, after you start up Messenger, choose Edit | Account Setup ... and set the outgoing (SMTP) server and user name. This needs to be done only once but without setting, you will not be able to send out mail. If you want to learn more about how SMTP setup and multiple mail mail accounts, read this document.
    • Password: Starting with M9, Mozilla ignores the password provided in the prefs.js file.
      • When accessing a mail server for downloading messages, you will be asked to provide a password via a dialog. If you want Mozilla to remember your password, use Edit | Account Setup ... menu and select "server" under each one of your accounts. Then check "Save password: box. You can also insert the following line into the prefs.js file:
        user_pref("mail.server.server1.remember_password", true);

        where "1" in "server1" should be changed to match your server number.

    • IMAP server setting:
      • Use Edit | Account Setup ... menu to set up a variety of IMAP server related options.
    • NNTP (News) server setting:
      • In M11, this is very easy to do. Use Edit | Account Setup ... menu and add an News server. Then when it is added, use File | Subscribe ... menu to add newsgroup you want to read.
      • Reading in different languages is now working if the charset parameter is specified in news articles. At this point, news reading in Chinese will be generally difficult since many Chinese newsgroups contain messages without any charset parameter.
    • POP Mail settings:
      • Use Edit | Account Setup ... menu and set up several different options using the server setting under each account.
      • You can set it up to keep the messages on the POP server after you have downloaded them, too.
  • Downloading POP mail:
    • The performance in this process improved greatly in M11 as compared to M10.
    • Note: some POP servers don' t handle multiple, simultaneous accesses to the same account well. In such cases, keep only one connection alive to use it trouble-free.
  • How various mail-related international functions are working at M11:
    • Address Book: now supports Non-ASCII (including CJK) input, editing and display. The following features are working.
      • Non-ASCII Input into card fields
      • List View pane -- proper international sorting
      • Each card view pane -- displays non-ASCII strings
      • Can re-edit existing cards with non-ASCII entries.
      • New message button -- quotes non-ASCII names correctly
      • Composer Address Picker -- now select non-ASCII names correctly.
      • Address auto-completion is working partially. If an Address Book entry contains non-ASCII characters, they are now displayed correctly. However, matching try with non-ASCII characters don't work with M11.
    • Multi-lingual mail viewing: This is working on all platforms.
      • Multilingual viewing is working on IMAP, POP3 and NNTP servers as long as the messages contain properly MIME-encoded headers and body with correct charset parameters.
      • View | Character Set menu is currently not working to override wrong MIME charset label, or view msgs which have no MIME charset (except for Latin 1) specified.
      • If you have a multilingual font or several fonts which together cover the Unicode ranges (e.g. Chinese, Japanese, Korean fonts + Pan-European fonts), we use them in displaying mail messages and headers for all the languages we support. We pay attention to the charset parameter in the Content-Type header and switch to an appropriate font. The Character Set menu is not needed to switch to different language views unless the message you're viewing is incorrectly labeled. If you would like a basic mono-weight multi-lingual font, you can get Bitstream Cyberbit font 2.0 here.
      • Earlier there were a few bugs which prevented Mozilla from displaying Thai (Windows-874 or TIS-620) mail messages. They have been fixed and now you can view mail messages sent in these encodings.
      • Viewing News: is working. Multilingual news articles viewing works if they have correct MIME charsets indicated in the articles. Be warned, however, that newsgroups postings are not always MIME-compliant and this could defeat our charset honoring mechanism.
    • Viewing non-ASCII attachments: generally working but there are some bugs.
      • Attachments should be viewable if they are of the same charset as the main body of the mail or if it has explicit charset parameter in the attachment headers.  If an attachment lacks charset parameter info and if its charset does not match that of the main body, that attachment cannot be viewed currently even when the Character menu is changed to match the charset of the attachment. A charset detector as discussed above can work on attachments without explicit charset information -- if it is turned on.
      • Multiple attachments in different languages: can now be viewed without changing the charset menu if each attachment's header contains a correct charset parameter. If you send a message with multiple attachments and if each attachment is a document with a meta charset tag, Mozilla will create a content-type charset parameter for each attachment from the meta-tag information.
      • Japanese attachments and auto-detection:
        • The auto-detection module set for the Browser via its Auto-Detect  menu work to detect the charset of mail attachments. See above on how to set an charset detection module.
        • Currently there is a bug which corrupts Japanese EUC-JP attachment display. To work around this problem, we have put in a mail specific charset detector which only works in Messenger under Windows only. (Note: Eventually this detector will be removed when the EUC bug is fixed.) When this is set, this detector rather than the Browser detector will be used in Messenger.  This detector will be ON even when the Browser detector is OFF. For those wishing to view Japanese EUC files attached to mail messages, we recommend that this workaround be put in place. There is no UI for this but this is how you can use it:
          • In the pres.js file, insert the following line:
            • user_pref("mail.charset.detector", "jaclassic");   <-- this is basically a detector module used for Communicator 4.x.
      • Printing: Basic printing is enabled. Currently it is rather primitive. Headers don't seem to be printed -- only body text.
    • View | Character Set menu and thread pane reloading:
      • The menu change causes the thread pane to reload properly. This makes it possible to display non-MIME-encoded headers which don't match the current Character Set menu setting.  Headers, body, and attachments without MIME charset information may not be displayed properly, however, even if the Character Set menu is changed.
    • IMAP Latin 1 folder name: displays OK. Multi-byte folder names (e.g. CJK) don't work yet.
    • International Sorting in Thread pane headers:  now works well in the Subject headers on all platforms. CJK characters are not displayed correctly in the Sender field and therefore cannot be tested. Sorting should be done according to the sort default for the language of your operating system. Date/Time sorting is also working as it should.
    • International Date/Time format:  now works for NT4, Win9x, and Mac for all locales. The format will be used according to your OS's date/time format setting.
    • Linux sorting:
      • There seems to be a problem with Latin 1 sort -- this is under investigation.
      • Also sorting is working for some Japanese locale names but not others. It might have to do with locale name aliasing. This problem is under investigation.
  • Sending Latin 1 & Japanese attachments/pages:
    • File | Send Page is now working in M11 in addition to attaching a local file to a message.
  • Send-related bugs:
    • When the Subject header contains more than a certain number of characters, MIME-encoding fails to occur and raw UTF-8 headers will be sent. Such headers will not be viewable except under UTF-8 encoding. This problem was fixed in M12. In M11, you might want to keep non-ASCII headers fairly short.
    • Under HTML send option, if you reply/auto-quote on a msg and then cancel without inputting at least one character into the text body, Mozilla will crash. If you decide to cancel this type of message, input a few characters into the text body before you cancel. This bug will be fixed in M12.
    • If you reply/quote a message which has an attachment bearing a meta-charset document tag, Mozilla may crash.
    • The original sender's name in CJK will be quoted only as dots. This problem was fixed in M12.
    • When you use Plain Text send option and Reply/quote a message, you may see strange characters at the beginning or the end of each quoted line. These characters will disappears when you send the message and therefore harmless but they are nonetheless impediments to editing.
    • In Forwarding inline an attached web page, contents except the URL links may be lost.
  • Sending messages in other languages: View | Character Set menu for New Mail Compose window is working for sending mail for many additional languages. Switch to the charset you want to compose a message in and then compose the message.  You will not see a checkmark next to the menu item yet, however. Let us know how we are in sending messages in other languages. Send your report to:
  • Composing Latin 1 mail messages:
    • In sending 8-bit range characters with HTML mail under Latin encodings, starting with M11, we will generally use 8-bit characters rather than HTML entities. However, certain special characters not in the chosen encoding will be turned into CERs (so-called HTML entities) or NCRs (numeric character references).
    • In sending 8-bit range characters with Plain Text mail, we will generally use 8-bit characters rather than QP-encoded characters. Those characters not in the chosen encoding, e.g. the EURO under ISO-8859-1 is currently turned into a "?" symbol. We are considering more user-friendly spec for this currently.
  • General Fallback strategy for sending characters not found in the chosen encoding:
    • CERs or NCRs will be used in HTML mail.
    • "?" will substitute for non-existing characters under Plain Text send option. In future, we may offer an option to send in UTF-8 or some other encoding which support the characters in question.
  • Domain Name completion: is now working. An user ID only input will be automatically completed with the default domain when the Enter key is pressed.
  • Message Send Status summary for Latin 1 and Japanese: No indicates that the functionality is not working well.

    Message send feature
    Latin 1 (ISO-8859-1)
    Japanese (iso-2022-jp)
    Header (subject, address)
    Body - HTML
    Yes (8-bit characters are sent as is w/o entities except when the chosen charset does not contain the character)
    Body - plain
    Yes (8-bit characters are sent as is w/o QP. When the chosen charset does not contain the character, "?" is used in its place currently.)
    Reply/forward header
    Reply/forward body html 
    Yes -- POP mail, IMAP, NEWS (but some bugs) Yes -- POP mail, IMAP, NEWS (but some bugs)
    Reply/forward body plain
    Yes - IMAP, POP, News.  (but some bugs) Yes - IMAP, POP, News (but some bugs)
    Send/View Attachment(s)
    Yes (Send - local file and web page) Yes (Send - local file and web page.)
    Copy/paste into headers and body
    Yes (accented characters copy OK) Yes  (from headers to body in HTML composer only) No (from body to headers)
Notes on Composing Latin 1 and Japanese Mail messages:
    • Composing Latin 1 Mail:
      • Copying/pasting accented characters into the headers and  body works
      • Keyboard input into headers (e.g. subject) also works for accented characters. Using the English keyboard for Latin 1 high-bit input, ALTGr + 0+Number Keypad method works, e.g. Right ALT key + 0232.
      • Make sure to switch the View | Character Set  to your chosen Character set name before you send out a message.
      • Basic MIME compliance is there: Header Q encoding, and Body QP encoding for accented characters.
    • Composing Japanese mail: works both for HTML and Plain text mail.
      • Basic Japanese input works for body.  Japanese input/copying  into the headers and body also work.
      • Mail goes out in ISO-2022-JP.  Header is B-encoded. (The Kanji-in escape sequence is that of JISX0208-1990/83. )
      • Make sure to switch the View | Character Set  to Japanese (ISO-2022-JP) before you send out a message.
    • Sending other charset mail -- is enabled. Please try out these new charsets! For example, Central European, Cyrillic, Greek, UTF-8, etc.
      • Though the mail text body can sense what keyboard you have selected and will switch font accordingly, there may be mapping bugs with some international keyboards.  If you find a bug with your charset/language, please file it here.
Mail/News (for Mac)
  • We don't currently test Mac for international features. Though we cannot vouch for accuracy, many of our Windows/Linux features should be working on Mac also.
List of Charset Converters available at M11:


  • Western (ISO-8859-1, Windows-1252, MacRoman), Central European  (ISO-8859-2, Windows-1250, MacCE), South European/Esperanto/Maltese (ISO-8859-3), Baltic/North European (ISO-8859-4, Windows-1257), Baltic/North European (ISO-8859-13), Cyrillic (ISO-8859-5, Windows-1251, KOI8-R,  ISO-IR-111 aka ECMA-Cyrillic, MacCyrillic, CP-866), Arabic (ISO-8859-6, Windows-1256) - (not in spec, might be removed from commercial build later) , Greek (ISO-8859-7, Windows-1253, MacGreek), Hebrew (ISO-8859-8 aka Windows-1255) - (not in spec, might be removed from commercial build later), Turkish (ISO-8859-9 aka Latin5, Windows-1254, MacTurkish), Nordic/North European (ISO-8859-10 aka Latin6), Celtic (ISO-8859-14), Western (ISO-8859-15), Armenian (ARMISCII-8), Thai (TIS-620 aka Windows-874), Ukrainian (KOI8-U, MacUkrainian), Vietnamese (VISCII, Windows-1258, VIET-VPS, VIET-TCVN5712), other Mac encodings (MacCroatian, MacIcelandic, MacRomanian).
  • Japanese (Shift_JIS, EUC-JP), Traditional Chinese (Big5, EUC-TW), Simplified Chinese (GB2312), Unicode (UTF-8, UCS-2, UCS-4), Korean (EUC-KR), Western (T.61-8bit) - support this for LDAP v2 and X.500.
  • Japanese (ISO-2022-JP), Unicode (UTF-7, IMAP4-modified-UTF7- Needed for IMAP folder names)