Firefox 3.6 Beta 5 Coming Right Up.

WARNING
Beta programs are programs that have been tested but will still have bugs, do not use if you do not feel comfortable running into minor/major bugs.

Mozilla is getting ready to release a new development milestone of Firefox 3.6. And it appears that the upcoming testing build won’t graduate the next version of the open source browser to Release Candidate stage. According to Mozilla, a new Beta release, the fifth one, is currently cooking and being readied for availability. Although the company hasn’t said anything officially, it is already offering testers a taste of Firefox 3.6 Beta 5 via its FTP servers, although, at the time of this article, the development milestone was not yet ready for public release.

Source -
Firefox 3.6 Beta 5 Coming Right Up - A preview release is already up for grabs - Softpedia

lol they have too many betas.