When I had Firefox 2, I also used spoofstick (what was a great little add-on). This is no longer supported in Firefox 3 :-((
I have removed the defunct add-in. But, if I right click toolbars and try to customise them, spoofstick is still lurking in there in the drop-down menu. In the menu customising facility, there is no entry there to allow removal of the defunct label.
I have been to the Firefox help forum and looked to see if there is a way of removing this label; but with no luck.
I have done a search in the registry with Revo Uninstaller, regseeker and regedit and there's no mention of spoofstick.
Not the end of the world, I agree; But any ideas how I might get rid of this non-existant facility in the toolbars/customise facility?