Goodware Rated 5 out of 5 stars
I'm not a Developer so I don't have a use for this add-on but that doesn't make it useless, Believe it or not there ARE people who use .application files.
P.S. don't whine; at the very least be thankful that Microsoft registered their add-on with Mozilla.
P.P.S. If you want to remove it then Reinstall it through AMO (addons.mozilla.org)