Great quality GIF background! Set at a comfortable speed and loops smoothly, no choppy loop nor appearance of sort. It definitely amps up that whole "hacker" wannabe experience. And it fits the whole border well...as well.

Would've been cooler if the text was neon green, but then there's a problem with the readability. And I agree with "Firefox user 18534139" with the tabs thing--there should be some color differentiation on the horizontal tabs.