Firefox issue

my firefox seems to hang when i minimize and maximize as well as when i close and open new tabs and windows. My computer is good enough to run bf2 on max settings so i dont think this should be happening, i dont have any adware or viruses.

This seemed to have happened after i upgraded to 1.5 i uninstalled deleted the folder and installed 1,0 but the problem is still here!

have any of you guys had this problem and/or have a fix for this

Delete user profile and create a new one (remembering to back up your bookmarks and such first).