You probably use Adobe flashplayer. Its last version seemed to be bugged. You can wait a new version or try gnash.
** Package changed: ubuntu => flashplugin-nonfree (Ubuntu) -- if firefox is opened i can not hear youtube videos sound with epiphany https://bugs.launchpad.net/bugs/377150 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
