How to change your Firefox throbber - Today's Browser Tip
Don't know what a throbber is? Why, it's the little spinny thing in the upper-right hand corner of Firefox (and other browsers) that tells you it's currently downloading something. The default throbber in Firefox is pretty nondescript, so why not spice it up a bit? Zerosign.net has a quick guide to replacing the throbber with an animated GIF of your design. Judging by the comments, YMMV, but it's worth a try.
