Uninstall Greasemonkey altogether. At this point, I don't trusthaving it on my computer at all. I would think that whoever is incharge of addons.mozilla.org should immediately remove theGreasemonkey XPI and post a large warning in its place advising peopleto uninstall it.

By the way, "Greasemonkey Hacks" is DEAD until we fix this. And I'mposting a big red blinking warning on every page of diveintogreasemonkey.org advising visitors to uninstall it, until all of these security holes are closed. This is why God invented the tag.