The latest beta version of Firefox is now available as a preview release. Take it for a test drive and let us know what you think
Please read before downloading
This is pre-release software: you may encounter compatibility problems with some websites and add-ons.
If you find a problem please let us know or file a bug.
For more details, read the release notes and known issues.
3.5b4 for Mac OS X 10.4 and above
English US 17.3MB
Release Notes – Other systems and languages listed below.