"Montium", I'm pretty sure.
Yes. It belongs to the mixed declension: the singular goes like in the consonantic declension (stem mont-), the plural like in the i-declension (stem monti-).
From another thread:> (Why anyone would want to suffer thru Internet Explorer, however, I don't know.)
I've never understood that sentiment. IE8 is just fine as far as I can see. What's more, IE lets you choose where you want to save a download; Safari, for example, just automatically dumps it on the quickly cluttered desktop and says "deal with it". And it can deal with MSHTML. :^)