You just deleted the extensions folder and they were gone?
Yeah. If I'm remembering right, anyways. In case anyone's confused because they have a Mac or something, it was Firefox's extensions folder, not an OS extensions folder. It's here: c:\documents and settings\MyUserName\application data\mozilla\firefox\Profiles\theWeirdProfileFolderName.default\extensions
I might have had to reinstall Firefox after removing the folder, I don't remember.