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Mozilla Foundation Security Advisory 2005-23
Title: Download dialog source spoofing
Reporter: Jakob Balle (Secunia)
Products: Firefox, Mozilla Suite
Fixed in: Firefox 1.0.1
Mozilla Suite 1.7.6
The true source of a download can be disguised by using a host name long enough that the most significant parts are truncated. Spoofing can be made even more convincing on windows if the subdomain labels contain a string of non-breaking space characters.
Do not download files from untrusted sites. Be suspicious if the download dialog shows the file comes from a different site than the one you are on. If the download source is a trusted one visit that site yourself to get the file by typing the address into the location bar rather than trust 3rd-party links to content.