After reading this, I've just noticed that my FF has the option. I've never felt the urge to use it - probably because I have a (127,127,127) background so that I can actually see my icons and text.

I think Glen justifies it well - it's not a tiny little feature, it's a load of unnecessary overhead. Good on him and the team for standing their ground.

Reading some of the comments on the tracker, I'm amazed at how much of a must have they consider it.