I started using Firefox 3 a few weeks ago and am immensely dissatisfied.
It seems to hang a fair bit. I try to start it up and nothing happens. I take a look in Windows Task Manager and it's there. I kill the process and try again.
Sometimes this fixes the problem, but sometimes it repeats itself. I kill it again, try starting it again, and so on. After a few cycles it may start up. Sometimes I just restart the machine which solves the problem.
I never had this issue with Firefox 2.
I also find it is generally slow to start up. The Bookmarks functionality has also degraded. When I go into my bookmark folders to select a link, I used to be able to right click there and there would be a "Sort by Name" selection. That's not there any more. Adding bookmarks is also very slow. The dialog to add a bookmark is now modal, and with no window title. It is really degraded, as if under development again or something.
I wonder what the hell they did to it?