Version of Firefox is 3.6.15. After an upgrade, some, but not all, pictures have a greenish color to them. We're talking things like jpg, not flash or anything like that.
Fix:
In the Firefox address bar, type: about:config
Yeah, yeah, you'll be careful. Set: gfx.color_management.mode
to 0 (zero, if you can't decide whether that's "oh" or "zero"). My setting that had not been working was 2.