i upgraded to flash player, I disabled the acceleration hardware checkbox thing and deleted cookies on firefox but youtube still won't play anything, youtube works on internet explorer though ugh please help!
i reinstalled flash player by adobe and reported the problem to adblock plus as well and I turned my laptop on today and its working again magically! so weird...may be it was a problem with their servers!
just get google chrome and be done with it, trust me, you'll never go back to firefox. It uses extensions like firefox (adblock etc) but it's very simplistic, not tons of dropdown menus and useless bars and stuff, just what you need to surf the web, and it's by far the fastest web browser there is, and that's not opinion that's a fact.