Well I just ran into an interesting problem. For some reason my images were failing to be displayed in Firefox, no problem in Safari, no problem in IE. The images were standard jpg images. I checked my code for any errors, mistypes, or logic problems, but nothing was found. I opened the image in Photoshop and tried re saving over the image to see if it was corrupted during the save, still, nothing.

After searching around forever, I find one anonymous side-comment in a forum saying “I know Firefox doesn’t like CMYK images but that’s not it.”I look into it, sure enough I check the image mode in Photoshop, and it’s CMYK, I convert to RGB, and low and behold, it worked.

In summary: Firefox hates CMYK.