So far I've only noticed this with my own digital photos but I haven't tried comparing images from other sites to see if it is effecting those as well. I noticed this last night after I edited a bunch of photos in Photoshop I then opened up a firefox window to view the files to make sure they look right. I noticed they looked kinda dull and the colors were washed out, I then opened up Safari to see if they looked the same in there and they did not. In Safari they look exactly how they look in photoshop. Has anyone else run into this problem with firefox?
What format are you saving them in? If you are using PNG images, Safari correctly fixes the colors to output the exact match, while Firefox and other browsers don't correctly fix the output before it is sent to the graphics card and thus, looks washed out.
Using 'Save As' that way embeds your color profile, which FireFox does not use. If you use 'Save for web' it will not embed a color profile, and the image will display the same on all platforms/browsers - and this will also result in a smaller file size, too