>>Some e-commerce sites like Ingram Micro don't work with FF. I believe it's because FF more closely adheres to standards and doesn't support MS extensions.
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>I had to install FF as the default browser on a client's PC yesterday, and I noticed that a couple things did not work properly. Spyware Blaster and the auto update feature of Norton Internet Security would not connect. I wonder if the problem was more the bad IE I was circumventing than FF though. Maybe they are wired to only use IE protocols.

If you're talking about the IE issues you mentioned in another thread, that sounds like a DNS issue. Anything which auto-updates will require functional DNS, not just a browser like IE or FF.