I use to use FF all the time however the load times just became to much. Google chrome is what I use now as much as I do not like them gathering all the data that they do. However the lesser of 2 evils.
Try this...Click on help next to window then click troubleshoot information then it'll go to a different website look to the right where it shows reset Firefox click on that then it'll reset Firefox. I had this problem before and this option worked.
Toolbars and other malware will corrupt the Firefox config file. Do what N4CYA said and do the reset, just backup your passwords first. Your bookmarks should be ok but you can back them up as well. You will have to reinstall any Add-ons but that is easy. Same thing if Firefox loads slow on this or all websites. Even after you remove the malware or toolbar the config change problem will remain, but the reset will start you with a clean config file. Your malware and anti-virus will not detect a corrupted config file. BTW this forum loads just fine (and fast) on Firefox 22.0 here.
Rather than start over from scratch just disable extensions in groups and then narrow them down.
Or just restart with extensions disabled to rule them all out. No sense doing it the painful way first.
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I'm not having issues as of yet on F.F. i got updated to 22.0 just before i came on here to post i was on Chrome when i came across the thread and thought i'd see how it would do for me).
But when i Depart from either browser i clear out all of my History for that Day i'm on and then i go to CC cleaner and Run it as Well so far doing this patter for the Last 3 to 4 has done rather well..