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Kevin Gerich have posted a custom stylesheet for content in Mozilla firefox (known as chrome/userContent.css. It looks really neat, its made for MacOSX (those spoiled mac-users) but works on Linux too. I have not tested it on Windows.
There is one thing wrong with it when you uses it on Linux, the focus rings is in black and are annoyingly bold. I will maybe create a modified version of it where this is fixed.
meanwhile, get the stylesheet at Kevins blog