Description of problem:
while watching a video clip on youtube, when i try to see it full screen firefox crashes.


Version-Release number of selected component (if applicable):

# rpm -qa | grep xulrun 
xulrunner-1.9.0.4-1.fc10.i386

# rpm -qa | grep firefox
firefox-3.0.4-1.fc10.i386

# rpm -qa | grep mozilla
mozilla-vlc-0.9.8a-1.fc10.i386
mozilla-filesystem-1.9-2.fc10.i386

# rpm -qa | grep flash
flashrom-0-0.14.20081103svn3723.fc9.i386
libflashsupport-000-0.5.svn20070904.i386
flash-plugin-9.0.124.0-release.i386



How reproducible:


Steps to Reproduce:
1.go to youtube.com
2.open one vide clip
3.after it starts playing, make it full screen
  
Actual results:
firefox crashes

Expected results:
the clip becomes full screen


Additional info:

at running firefox from terminal i got this:

$ firefox

(firefox:5905): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed

(firefox:5905): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed

(firefox:5905): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed

(firefox:5905): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed

(firefox:5905): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed

(firefox:5905): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed

(firefox:5905): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed

(firefox:5905): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed

(firefox:5905): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed
The program 'firefox' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadLength (poly request too large or internal Xlib length erro'.
  (Details: serial 30874 error_code 16 request_code 144 minor_code 17)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
/usr/lib/firefox-3.0.4/run-mozilla.sh: line 131:  5905 Segmentation fault      "$prog" ${1+"$@"}

then i've searched bugzilla and found this bug:

https://bugzilla.redhat.com/show_bug.cgi?id=470780

but it was for rhel x86_64 so i decided to open another bug for f10 x86 :)

additional info requested there:

# rpm -qa | grep plugin
audacious-plugins-freeworld-wma-1.4.5-2.fc10.i386
mail-notification-evolution-plugin-5.4-4.fc10.i386
audacious-plugins-amidi-1.5.1-2.fc10.i386
plymouth-plugin-pulser-0.6.0-0.2008.11.17.3.fc10.i386
PackageKit-gstreamer-plugin-0.3.12-1.fc10.i386
gstreamer-plugins-good-0.10.11-1.fc10.i386
gstreamer-plugins-flumpegdemux-0.10.15-4.fc10.i386
gutenprint-plugin-5.0.2-3.fc10.i386
plymouth-system-plugin-0.6.0-0.2008.11.17.3.fc10.i386
audacious-plugins-wavpack-1.5.1-2.fc10.i386
gstreamer-plugins-schroedinger-1.0.5-3.fc10.i386
plymouth-plugin-solar-0.6.0-0.2008.11.17.3.fc10.i386
PackageKit-yum-plugin-0.3.12-1.fc10.i386
gstreamer-plugins-bad-0.10.9-1.fc10.i386
purple-plugin_pack-pidgin-xmms-2.4.0-1.fc10.i386
audacious-plugins-freeworld-mp3-1.4.5-2.fc10.i386
audacious-plugins-freeworld-alac-1.4.5-2.fc10.i386
anaconda-yum-plugins-1.0-3.fc10.noarch
gstreamer-plugins-farsight-0.12.9-3.fc10.i386
gstreamer-plugins-base-0.10.21-2.fc10.i386
mythplugins-0.21-14.fc10.i386
p7zip-plugins-4.58-1.fc10.i386
gstreamer-plugins-ugly-0.10.9-2.fc10.i386
plymouth-plugin-spinfinity-0.6.0-0.2008.11.17.3.fc10.i386
setroubleshoot-plugins-2.0.12-1.fc10.noarch
audacious-plugins-1.5.1-2.fc10.i386
audacious-plugins-freeworld-mms-1.4.5-2.fc10.i386
alsa-plugins-pulseaudio-1.0.18-1.rc3.fc10.i386
audacious-plugins-vortex-1.5.1-2.fc10.i386
plymouth-plugin-fade-in-0.6.0-0.2008.11.17.3.fc10.i386
purple-plugin_pack-2.4.0-1.fc10.i386
audacious-plugins-freeworld-tta-1.4.5-2.fc10.i386
purple-plugin_pack-pidgin-2.4.0-1.fc10.i386
flash-plugin-9.0.124.0-release.i386
gstreamer-plugins-bad-extras-0.10.9-1.fc10.i386
audacious-plugins-freeworld-aac-1.4.5-2.fc10.i386
libextractor-plugins-flac-0.5.20b-2.fc10.i386
plymouth-plugin-label-0.6.0-0.2008.11.17.3.fc10.i386

i'll be back with debuginfo asap.