Mozilla Developer News

Firefox 3.5 preview release
The 800,000+ users of Firefox 3.5 Beta 4 will be receiving an update to a “Firefox 3.5 Preview” release in order to assist us with further testing and feedback. This update contains many fixes for stability bugs, correctness fixes for our JavaScript engine, and improvements to our built-in support for open Ogg based video and audio playback.

Mozilla Developer News