When I upgraded to Firefox 12, certain background images wouldn't display properly, while others wouldn't display at all. But it only happened on one of my computers. All the others were fine. The one where things weren't working was my desktop computer with the nice monitor, so it was rather important that things work. The symptoms were that (a) for some background images, rather than display the image, it would display the first line of the image, and repeat it over and over, in one long bleeding stripe (b) if one did "view image", the image itself did display correctly (c) for some semi-transparent images, they didn't display at all.
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