Well it looks like this link explains the problem:
https://lists.ubuntu.com/archives/hardy-changes/2008-April/011149.html
" * fix "frequent crashes with flash on youtube"; we fix this by
demoting libflashsupport from depends: to suggests: (LP: #192888)
This has positive as well as negative consequences:
(+) increased stability for firefox and nspluginwrapper
(-) pulseaudio users reported that this breaks sound if flash
while other applications are running that use the sound
device for output.
Users that installed libflashsupport during hardy cycle should
uninstall it to increase stability.
"
I am uninstalling libflashsupport and will reinstall the Flash-plugin
and see if it stabilizes.
--
(firefox:8047): GLib-GObject-CRITICAL **: g_object_unref: assertion
`G_IS_OBJECT (object)' failed
https://bugs.launchpad.net/bugs/221668
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