Comment # 7 on bug 989945 from Atri Bhattacharya

@(In reply to Takashi Iwai from comment #6)
> 
> IIRC, we had an issue in gstreamer in the past.  But since Pidgin is the
> first application that shows an issue, I reassign back to GNOME guys to take
> a look.

OP says this is also an issue with Firefox notifications, not only pidgin.