101 Things Mozilla Can Do That IE Cannot
This article lists features, abilities, etc that Mozilla (v 1.2) has that IE 6.0 does not. 101 things — that’s a lot. Granted a few are relatively minor things, but the exhaustive list would definitely be a handy document to have when trying to persuade higher ups that Mozilla/Firefox is the way to go.
I have no idea how many things on the list also apply to Firefox, but I would imagine most do.