Mozilla's Firefox 4 has reached Beta 8 and is set to go live today. This new test build which is getting close to it's Release Candidate point offers no new features, unlike previous betas.
Instead, the release is focused solely on bug fixes and performance issues. Previous betas have been bugger than past betas for some users - Mozilla is obviously trying to correct this.
Mozilla aimed high with Firefox 4 - GPU-based rendering was a big step and it has been their toughest one yet. If Mozilla can iron out the bugs and get performance up, it might see a winner on it's hands once again.