If it's b5's fault, why does it do the exact same thing in Seamonkey (the stable version based on gecko 1.8)

On Sun, Apr 13, 2008 at 7:41 AM, Kristoffer Lundén <kristoffer.lunden@gmail.com> wrote:
Bah. Spoke too soon, it still does crash. So it seems beta 5 is the one
common point of failure, at least for me. It has worked very nicely from
alphas onward until b5.

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[hardy] [regression] Firefox 3 Beta 5 SEGFAULTs constantly when switching flash pages
https://bugs.launchpad.net/bugs/212877
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of a duplicate bug.

Status in Source Package "firefox-3.0" in Ubuntu: Incomplete
Status in Source Package "flashplugin-nonfree" in Ubuntu: Incomplete
Status in Source Package "libflashsupport" in Ubuntu: New

Bug description:
Firefox was updated today, and crashes when switching from a flash page to another.
This happens on youtube almost all the time.

Running firefox in a terminal:

$ firefox

(firefox:25251): Gtk-WARNING **: Theme file for semi-transparent has no directories

** Message: GetValue variable 1 (1)
** Message: GetValue variable 2 (2)
** Message: GetValue variable 1 (1)
** Message: GetValue variable 2 (2)
** Message: GetValue variable 1 (1)
** Message: GetValue variable 2 (2)
** Message: GetValue variable 1 (1)
** Message: GetValue variable 2 (2)
** Message: GetValue variable 1 (1)
** Message: GetValue variable 2 (2)
** Message: GetValue variable 1 (1)
** Message: GetValue variable 2 (2)
Segmentation fault (core dumped)

I don't believe the Gtk-WARNING message is relevant for this problem; it is displayed when running most gtk apps.
I don't know how to get a backtrace, as I can't run firefox through gdb, because /usr/bin/firefox is a script.