[23:37] <Unit193> Well, just for random info, Aurora (mostly same packaging as hg20130226r128460) builds and seemingly works fine when you enable gstreamer (http://unit193.tk/diff.php?file=aurora-gstreamer.diff) using the patch in https://bugzilla.mozilla.org/show_bug.cgi?id=760140 (http://unit193.tk/diff.php?file=gstreamer.diff).
[23:37] <ubot2`> Mozilla bug 760140 in Video/Audio "AAC and MP3 not supported in <audio> (but AAC supported as a <video> sound track!) when the Fluendo Complete Codec Pack is installed" [Normal,New]
[23:39] <Unit193> (That is, after you update the patch for current Aurora.)  As I said, random info as it is outside of upstream.