duckster,
You're right. There is one thing that cannot be downloaded from Mozilla: Microsoft Updates. Microsoft looks for its own product. That is the only time I ever use IE. (FYI: as of a few days ago, they still haven't released the critical patch. Last time this happened, they said it would be released during their normal quarterly updates. There was such an industrial uproar, they released it early.)

With that, I've never had a problem downloading anything (except critical patches) using Mozilla. I do occasionally have trouble downloading something, but that is not Mozilla: it's the server on the other end or sometimes my stupid computer forgets what it's doing. I tend to multi-task as much as A.B.