For a start off ActiveX is bloody useful. The amount of systems that have been quickly nocked together that use it are not going anywhere soon. This is *slightly* off topic however as.
FF has lower level access than IE, because IE will by default run in protected mode. FF does not.
Now I'm not for a second saying that protected mode is a panacea, in fact I would say I dislike it in the way I dislike firewalls been used as a solution for chronically bad design (I always say write your nTier stuff as if it was all PUBLIC, then with the firewall as an added bonus! its not as if its remotely hard to do your remoting very securely now adays!)........
And on to the actual crux of the matter, most cooperate network guys are completely incompetent lazy good for nothing bums. Except the ones here of course Any chance of that viso license that was requested and authorized over a month ago been installed any time soon?
The thing is FF doesn't have anything as simple as the policy manager IE has inside a windows AD. And a shocker is most companies run that, and want something which slides in nicely.