i just upgraded to firefox 4 and after i finished installing it, it said that 3 add-ons weren't compatible with this version, avg safe search, divx web player (i didn't catch the version, it was 2.0 something), and now when i try to play anything online that uses dvx web player firefox blocks up. what can i do about this?? i mean besides downgrading to the previous version, is there a way to fix this? i have windows xp if that's relevant...