superlex: It's related to Stage Video which is used only by YouTube and few other sites, not by Facebook; embedded videos have no effects on this. Take a look at bug's explanation and known workarounds at http://askubuntu.com/a/131040/19674
(BTW, it's a community wiki, I don't get any karma for upvotes, so please don't take it as a shameless self-promotion)
superlex: It's related to Stage Video which is used only by YouTube and few other sites, not by Facebook; embedded videos have no effects on this. Take a look at bug's explanation and known workarounds at http:// askubuntu. com/a/131040/ 19674
(BTW, it's a community wiki, I don't get any karma for upvotes, so please don't take it as a shameless self-promotion)