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From: naddy@mips.inka.de (Christian Weisgerber)
Subject: Re: Firefox 19 vs large images
Date: Mon, 4 Mar 2013 11:49:51 +0000 (UTC)
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References: <kgteb0$18nr$1@lorvorc.mips.inka.de>
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Originator: naddy@mips.inka.de (Christian Weisgerber)
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Jan Beich <jbeich@tormail.org> wrote:

> Try setting MOZ_DISABLE_IMAGE_OPTIMIZE=1 in environ(7) or
> disabling gfx.xrender.enabled in about:config.

Bingo!  Either one of these fixes the problem for me.
(You have to restart Firefox after toggling gfx.xrender.enabled.)

-- 
Christian "naddy" Weisgerber                          naddy@mips.inka.de