Arch Linux

Description:
Gecko mediaplayer crash firefox.

[...]
Program received signal SIGSEGV, Segmentation fault.
0x00007fffd92491d2 in ?? () from /usr/lib/gio/modules/libdconfsettings.so
(gdb) where
#0 0x00007fffd92491d2 in ?? () from /usr/lib/gio/modules/libdconfsettings.so
#1 0x00007fffd9249695 in ?? () from /usr/lib/gio/modules/libdconfsettings.so
#2 0x00007fffd924822d in ?? () from /usr/lib/gio/modules/libdconfsettings.so
#3 0x00007fffd924ab25 in ?? () from /usr/lib/gio/modules/libdconfsettings.so
#4 0x00007fffedcd1752 in ?? () from /usr/lib/libgio-2.0.so.0
#5 0x00007fffedcd432a in ?? () from /usr/lib/libgio-2.0.so.0
#6 0x00007fffedcd522b in g_settings_get_value () from /usr/lib/libgio-2.0.so.0
#7 0x00007fffedcd5fc3 in g_settings_get_boolean ()
from /usr/lib/libgio-2.0.so.0
#8 0x00007fffd9454681 in GetMIMEDescription() ()
from /usr/lib/mozilla/plugins/gecko-mediaplayer-dvx.so
Additional info:

firefox-4.0.1
gecko-mediaplayer-1.0.3-1

Seems something really similar to this bug:

http://bugs.gentoo.org/279419

have not tested if recompiling it can solve the problem.