Created attachment 378883 [details]
File: backtrace

#2  <signal handler called>
No symbol table info available.
#3  0x000000364b6326b5 in raise (sig=<value optimized out>)
    at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
        resultvar = 0
        pid = <value optimized out>
        selftid = <value optimized out>
#4  0x000000364b633e95 in abort () at abort.c:92
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 
    0x7f090a4cd952 <_ZN13totemNPObject13DoubleVariantEP10_NPVariantd+28874>, 
            sa_sigaction = 
    0x7f090a4cd952 <_ZN13totemNPObject13DoubleVariantEP10_NPVariantd+28874>}, 
          sa_mask = {__val = {233194111920, 140735362455760, 1296, 
    140735362456000, 233193229142, 206158430232, 140735362456016, 
    140735362455792, 233193138984, 206158430256, 140735362456040, 
    139676473572192, 16, 139677400150080, 4321, 140735362483888}}, sa_flags = 
    1265872141, sa_restorer = 
    0x7f090a4cd75a <_ZN13totemNPObject13DoubleVariantEP10_NPVariantd+28370>}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#5  0x000000364b62b7a5 in __assert_fail (assertion=
    0x7f090a4cd952 "!plugin->mExpectingStream", file=<value optimized out>, 
    line=1296, function=<value optimized out>) at assert.c:81
        buf = 
    0x7f08f6973b60 "firefox: totemPlugin.cpp:1296: static void totemPlugin::ViewerOpenStreamCallback(DBusGProxy*, DBusGProxyCall*, void*): Assertion `!plugin->mExpectingStream' failed.\n"
#6  0x00007f090a4ca2cc in totemPlugin::ViewerOpenStreamCallback(_DBusGProxy*, _DBusGProxyCall*, void*) ()
   from /usr/lib64/mozilla/plugins/libtotem-narrowspace-plugin.so
No symbol table info available.
#7  0x000000365120e50a in complete_pending_call_and_unlock (connection=
    0x7f0920d0a700, pending=0x7f08f17fdab0, message=<value optimized out>)
    at dbus-connection.c:2227
No locals.


-- 
Fedora Bugzappers volunteer triage team
https://fedoraproject.org/wiki/BugZappers

(Not that it really needs confirming, but yum removing totem-mozplugin fixes the crash for me.  Too bad I didn't get prompted to install totem's debuginfo or I could have figured out the transgressor myself...)

Knowing now that it's totem's plugin at fault, this started between these sets of upgrades (maybe only the plugin matters, can't hurt to mention it):

Nov 20 00:18:25 Updated: totem-2.28.3-1.fc12.x86_64
Nov 20 00:19:12 Updated: totem-mozplugin-2.28.3-1.fc12.x86_64
...
Dec 16 20:42:45 Updated: totem-2.28.4-1.fc12.x86_64
Dec 16 20:43:14 Updated: totem-mozplugin-2.28.4-1.fc12.x86_64

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