I've been having problems with firefox too! At first I thought it was because I'm also using a program called "self-control" which blocks several websites.... but I've closed that program now and its still stuffing up so I've resorted to safari.
I have it on my laptop (Vista) and it's been working just fine for a week now. I'm always nervous about upgrading for fear the new version will create more headaches for me. Maybe try reinstalling it or rolling back to the previous version. Good luck getting it all to work.
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Do you have add-ons? Can you disable them all, then add them back one by one to see if one of them is conflicting with the new version?
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