Today we've shipped Firefox 4 Beta 10. If you haven't tried a Firefox 4 beta yet, you should definitely give this one a spin. It's pretty amazing.
If you've been tracking our betas, you'll be pleased to hear we've got more than 500 fixes for you since Beta 9 including some huge performance, stability and usability wins. It's our fastest yet. It's more stable than Firefox 3.6. It's polished up to near release-quality in every way.