Firefox 3.0.x has a bug in it’s javascript handling that makes Flickr go insane for some people who use Nvidia drivers. I had tried an earlier beta and was disappointed to see that the bug was not addressed.
I’ve been using beta 3 and I have not been able to reproduce the bug. The javascript is fast. It might not be Chrome or Safari 4 beta fast, but it is noticeably more responsive than Firefox 3.0 and all the extensions that I actually use are compatible.
Google Gears is not compatible yet but the faster javascript makes my user experience fast enough that I can’t see the difference. And I only use gears with WordPress, so it’s not like I am really missing out at this point.
I’ll keep kicking it around but this beta looks solid.