I use Debian unstable, amd64 port, on a PC with a 64 bit AMD chip.The latest version of Iceweasel, iceweasel_3.0~rc2-1, sometimes fails to display images. I suspect that javascript is involved. For example see the url:
http://radar.weather.gov/radar.php?rid=lwx which is a US Weather Bureau radar image. What is the problem?