libgstfaad.so = GStreamer ?

libgstlibav.so = GStreamer ?

libgstbcmdec.so

libgstisomp4.so

libgstcoreelements.so = GStreamer

libgstaudio-1.0.so.0.405.0 = GStreamer

and many more

As a test, remove GStreamer from your system.

You can set this pref to false on the about:config page to disable GSTreamner support for the HTML5 media player.

• media.gstreamer.enabled = false

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config