Mozilla released the tenth beta for Firefox 4.0 on January 25th. This is a regular beta release and is being made available for testing purposes only. New stuff in this Beta 10 release: Compatibilty and stability improvements when using Adobe Flash on Mac OS X Improvements in memory usage Support for a graphics driver blacklist to improve stability See the complete changelist from the previous beta For more info see the release notes for Firefox 4 Beta 9. The next planned release is the Beta 11 then (maybe) moving in to the Release Candidate (RC) builds.