firefox fullscreen animation

Switching web browser to fullscreen is more and more usefull with web applications appearing. But firefox3 got an animation on the upper screen when entering in fullscreen. On all the computers i have seen it, this animation is not smooth and it sligthly disturbed me. If you are like me, to disable this animation is simple. put "about:config" in the location bar, then search for "fullscreen", and set "browser.fullscreen.animateUp" to 0. You are done.