[Bug 86338] Crash on submitting forum reply (AnandTech)

[Robor]

Public bug reported:

Binary package hint: firefox

Firefox has been intermittently crashing when posting a reply to a
message on the AnandTech forums (http://forums.anandtech.com).  I posted
a few messages earlier today without issue but just replied to another
topic and Firefox crashed.

1.  Log into AnandTech forums
2.  Find a message and open the link
3.  Click on one of the 'Reply' buttons
4.  Type text of message
5.  Click 'Add Reply' button
6.  Firefox crashes

What should happen is the 'reply' window will close and the main page
will refresh including the new post.  This crashing has happened several
times and (so far) has not happened at any other time.  The last time I
launched Firefox I did so from a terminal so I could look for some error
output.  Here's what I got:

(Gecko:15252): GLib-GObject-WARNING **: invalid uninstantiatable type
`(null)' in cast to `GtkWidget'

(Gecko:15252): GLib-GObject-WARNING **: invalid uninstantiatable type
`(null)' in cast to `GObject'

(Gecko:15252): GLib-GObject-CRITICAL **: g_object_get_data: assertion `G_IS_OBJECT (object)' failed
Segmentation fault (core dumped)

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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Crash on submitting forum reply (AnandTech)
https://launchpad.net/bugs/86338