Before the build copy of Firefox (known as “Minefield”) upgraded itself on my Mac, dying a horrible and immediate death in the process, one other change I noticed in the upcoming version of Firefox is that color management is now on by default.
I also noticed, again before the crash and burn death, that the new version seems to be much more efficient and fast compared to the old.
As pointed out in comments, Bobby Holley has an excellent discussion on color management and the state of Firefox. Bottom line, in the interests of performance, the new version of Firefox will have color profiles turned on, by default, for “tagged” images: images with embedded color profiles. I started embedding profiles for my pictures about 2 months or so, ago, in hopes that more browsers will follow this path.
It would be nice to have full color management, but I think support for color profiles in images is a good interim solution. This is also the approach that Safari uses, and hopefully Opera, too, eventually.