Comment 1 for bug 648744

I made same experience with same setup like above. Just had an interesting side effect too, that I do not know on how to eliminate again: Ubuntu startup sound as well as some Skype sounds (like incoming call ringing, contact signs on or off) and Firefox sound notifications (up to now I discovered Private Browsing Sound) disappeared and I cannot recover them anymore.
I had installed your v 1.1 + libnotify-bin. Even removing them again did not resolve my sound issues.

I agree with above user to prefer Ubuntuzilla releases of Mozilla due to earlier updates than the official Ubuntu repository does.

1. Does anyone have a clue on how I can recover lost sounds?
2. Please also include support for Mozilla-build version of Thunderbird.

Thank you in advance.