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From: Jan Beich <jbeich@tormail.org>
To: Darren <darren780@yahoo.com>
Subject: Re: firefox visual bug
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Darren <darren780@yahoo.com> writes:

> Getting an odd bleed through. When I thought it might be my
> javascript I made this video.
> http://www.youtube.com/watch?v=I4CFjyv39VQ
> perhaps you may have some insight?

Looks like a rendering glitch in gfx driver. Try xf86-video-vesa.
Otherwise, to debug the issue should be reproducible within pristine and
virtualized environment e.g., poudriere + vbox or tinderbox + qemu.

--
asking on freebsd-x11@ list or mozilla forums may help, too