For those of you who have not yet installed 0.9 of FireFox you might want to backup before you do. Some people have reported cases while upgrading that their systems have locked up, then upon restart it exicuted an infinate loop sucking all system resources until all of the programs crashed.
Some users have had to nuke their HDD because of this.
I didn’t have that problem. However, when I installed 0.9 I lost all my bookmarks and preferences. So far it’s just been me though, so I’m willing to bet I did something dumb that I didn’t notice.
And concerning the bookmarks, it looks like the profile are not handled the same way they were handled in 0.8. But it seems that launching Firefox with the parameter “-p” lets you choose the profile directory (I haven’t tried that).