Sometimes when I open a new tab, it opens as the same webpage as the first tab instead of the general blank new tab page. Then when I try to navigate the new tab to a different webpage, it navigates all open tabs together. So I can't have multiple different webpages opened in different tabs. I have to close Firefox, open task manager, force stop Firefox, then reopen Firefox, and that usually solves the problem temporarily. My add-ons are: adblock plus 2.0.3, cacaoweb 1.0.26, divx plus web player html 5 video 2.1.2.145, favicon picker 2 0.6.2.15, greasemonkey 0.9.15, microsoft .net framework assistant 0.0.0, move media player 7, open download2 3.2.1, stumbleupon 3.99. I just upgraded to Firefox 10, althought I still had the same problem before I upgraded, and Windows Vista.