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Date: Mon, 17 Nov 2008 18:14:55 +1300
From: Mark Kirkwood <markir@paradise.net.nz>
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To: Jim Pingle <lists@pingle.org>
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Cc: freebsd-x11@freebsd.org
Subject: Re: Firefox 3 displays pieces of desktop background
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Jim Pingle wrote:
>
>
> I don't have much in the way of an explanation, but I was also seeing
> this with Firefox 3.0.x when viewing iGoogle. It may have been the theme
> I use with iGoogle (Earth-light). However, I am unable to reproduce this
> today, even with your test page and Firefox 3.0.4.
>
> I had just updated my world and kernel today and also updated Firefox to
> 3.0.4 today (along with all other ports).
>
> I use Opera more often than Firefox on that workstation (It's not a
> speed demon, so Opera is much faster) so I can't say for sure when the
> problem really disappeared, only that it is not there today.
>
>   
Could be one of these (raised on Linux platform but could just be tried 
to Xorg...):

https://bugzilla.mozilla.org/show_bug.cgi?id=383292
https://bugzilla.mozilla.org/show_bug.cgi?id=343993