Hi. I'm actually on Windows7-HomePremium using Firefox 30.0 (up to date). Recently, since like 3 or 4 days, Firefox has stopped to load most of embed video. I'll try to explain everything that might be useful for you to help me. -Youtube and Dailymotion videos = Perfectly works. Both normal sized and fullscreened. -Twitch.tv (and Azubu.tv which is less known) videos = Doesn't "load", it's not blank tho. The "player" region is black but I can still hear the sound. The strangest part in this, is that if I double-click the player to set it onto fullscreen, it actually works. Screen of what happens : Normal webpage: http://puu.sh/aaphq/998d7ea568.png Fullscreen of the player: http://puu.sh/aapik/4530aeef48.png (Video works, I just made sure that I wasn't showing it's content because it's not like you and I do need it for this problem to get solved.) Same problem with embed videos like from twitter/tweetdeck. Screens: http://puu.sh/aapA3/34492439dd.png (Tweetdeck) http://puu.sh/aapDi/845a235e3c.png (Twitter) I think I told everything I could share about my problem. I really look foward for someone to solve it. Thanks in advance. Best regards, MoeHentaiMiku. Edit 1: I already tried to fix my flash player by reinstalling it two times and setting it "the best way" (Like turning hardware acceleration off etc..), it didn't help.