Sent to you by Vihang Shah via Google Reader:
If the digital photo you just uploaded looks more washed out in Flickr than it does in your desktop image editor, that's because Firefox 3's advanced color management capability isn't turned on by default. To turn it on, type
about:config in Firefox 3's address bar, then click the "I'll be careful, I promise!" button. Then, in the Filter field, type gfx.color_management.enabled and set that value to true (its default value is false). Restart Firefox. From there on in, your photo colors will be richer than they were. Why isn't this value true by default? Well, according to Mozilla, you'll see a 10-15% performance hit using this setting, but if you've got a reasonably fast machine, it'll be worth the better-looking photos. Hit the link below for an extended explanation of Firefox's color profile support.