Why does my computer not like the new version of FF V31.00?

Question

It started about a 7-10 days ago. I was alerted that a New Version of FF v31 was available to download. So I d/l
installed it and blankety blank software would not properly. Sometimes it would load the FF Browser but any attempt to go between websites would take forever. Sometimes all I would get is a single tab showing and the
windows 7 Aero icon would spin itself silly. I would try to put it in safe mode but the same results as above. Finally after losing several buckets of sweat I read that my Anti-Virus software could be blocking FF. I thought why would it stop blocking this version when it had allowed previous versions w/o problems. I go to software rules and change it from auto to allow. I re-installed the v31.00 and it worked........... for 3days.
Today, It started acting up again. This time I would be reading a webpage and the mouse would not scroll or I would attempt to exit out a tab. No go. So I exit out of FF and tried to go back in. FF resorted back to my first experience. I went back to look if Norton 360 had changed the rules on me AGAIN. No everything was like it was before. I have now re-installed it 3 times today. Finally after re-installing for a 4th time I hit restart FF and everything is back to normal. I was under the impression when I hit restart I would lose all my profile settings(Bookmarks)/ But everything is back to normal..........for the time being. I have never had this much problems before. If it was a virus why would IE work like a champ but not FF.
Anyway I pray A FF expert can lead me down the paths of righteouness sake.

Answer 1

Some problems occurs when your Internet security program was set
to trust the previous version of Firefox, but no longer recognizes your
updated version as trusted. Now how to fix the problem: To allow
Firefox to connect to the Internet again;
* Make sure your Internet security software is up-to-date (i.e. you are running the latest version)
* Remove Firefox from your program's list of trusted or recognized programs, then add it back. For detailed instructions, see
'''[https://support.mozilla.org/en-US/kb/configure-firewalls-so-firefox-can-access-internet Configure firewalls so that Firefox can access the Internet.]''' {web link}