I have created one more plugin for firefox, this one is useful for users of Movabletype. The plugin allows the user to search the excellent MTLookup site from within the firefox browser. This was created as I recently wanted to look something up using MTLookup, and for some reason I could not remember the name of the site, and I had not bookmarked it as it was an obvious name! Doh!
It seems reasonable at this point to reference the extension 'SearchPluginHacks'.
More MT related firefox plugins can be found here
(Update: This plugin linked to by the creator of mtlookup - I just hope that a rewrite is not needed when V3 of mtlookup is created!)