It's not a trouble with Firefox but the nvidia-graphics-drivers several persons meet the similar trouble, see Bug #763808, Bug #771788
** Package changed: firefox (Ubuntu) => nvidia-graphics-drivers (Ubuntu) -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-graphics-drivers in Ubuntu. https://bugs.launchpad.net/bugs/773951 Title: Vidéo on each site in full screen mode Ubuntu 11.04 _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp