You are currently viewing a snapshot of taken on April 21, 2008. Most of this content is highly out of date (some pages haven't been updated since the project began in 1998) and exists for historical purposes only. If there are any pages on this archive site that you think should be added back to, please file a bug.

Localizing Firefox

Author: Benjamin Smedberg <>

Building a Localized Firefox

By default, the Firefox source tree pulls and builds only the English (en-US) localized files. If you wish to build Firefox in another language, you must pull some extra files from CVS and supply special options in your .mozconfig:

Pulling non-English locales from CVS

In your .mozconfig file, add the following lines (where ab-CD are the language codes you wish to checkout):

mk_add_options MOZ_CO_LOCALES="en-US ab-CD ab-CD"

If you have write access to the l10n CVSROOT, configure LOCALES_CVSROOT:


Building a non-English Firefox

In your .mozconfig file, add the following line:

ac_add_options --enable-ui-locale=ab-CD

During development cycles where there is not a l10n-freeze, the non-English locales may not work correctly.

Guides For Localization

Firefox Localization Teams

The Firefox Localization Teams are listed on the L10n Wiki page.