Mozilla has published Firefox 4.0 Beta 12, this new update promises enhanced performance and increased stability. Additionally, hovering over links will now display the URL at the bottom of the window rather than in the location bar. If you want to give the beta a try you can download it over here.
Biggest changes in this beta:
Increased performance while viewing Flash content
Improved plugin compatibility with hardware acceleration enabled
Hovering over links now displays the URL at the bottom of the window rather than in the location bar
General stability, performance, and compatibility improvements