i dont know
quite possibly either
Okay, if it's FF (which it also is as it underlines internet acronyms and the like phrases in red) we can't do anything about it.
As for SMF's "Spell Check" button, that uses
this program that's installed on the server and is not a part of SMF.
So if we're to add words to the SMF's Spell Check feature, that involves adding words to Aspell's dictionary. I'll look into that at some point.