I got to spend too much time the last two days fighting the good fight while trying to update and redeploy a Firefox extension that creates a toolbar of popular links for the college where I work. Firefox toolbar are nifty creatures, but they can be finicky.

To start, in order to even offer one on your web site, and to have it be downloadable as more than a page of digital vomit, you need to make sure your server's configured to serve the Firefox extention document type, as documented in Mozilla's "Extension Packaging" instructions.