Firefox 18.104.22.168 is out and promises to fix quite a few stability issues. Yeahhh!
I just upgraded tonight on some of of my computers. The upgrade went smoothly. None of the extensions I’m using broke. Except that on Kubuntu, I could not login to the dreamhost panel. I kept getting sent back to the login screen while it worked without a hitch from windows.
Deleting the cookie for dreamhost did the trick.
Could be related to some changes in the way the cookie is encrypted, that the site is accessed via https, but it still doesn’t explain why it worked on windows. Although there is the possibility I never connected from that machine before and therefore did not have a cookie.