Works great, would be perfect with keyboard hotkeys

It does work. But sometimes full-window video becomes static on YouKu. Cancel maximizing, the video splits to top and bottom ones. The up one is static, the bottom one is still playing, but with the picture being covered by web characters.

Яндекс, mail.ru, ВКонтакте, Одноклассники - не работает. Твиттер - пытается открыть все ролики и гифки. В постах на mail.ru работает. Люди благодарны разработчику.