The fourth beta of Firefox 3.5 is out and, at least on the Mac, it's sucking wind. It's ugly as sin. Scroll bars are broken. You're bombarded with password pop-ups as soon as you restart (one for each web site you have open instead of just one for the entire browser). Finally, they still haven't fixed this AppleScript bug. (Well, seems they fixed part of it; but there are at least three more related AppleScript bugs they haven't fixed so scripts that worked in Firefox 1 and 2 still don't work.) Is it time to give up on Firefox? If only Safari had a decent plug-in ecosystem.
They've also released Firefox 3.0.10 to fix a security vulnerability.