>>Problems I've encountered with FF:
>>
>>- does not support ActiveX controls natively. These days this is probably a *good* thing (for security reasons), but there is still a (dwindling) number of sites that require them
>>
>>- I've encountered some government of Canada/government of BC sites where I have to submit corporate filings on-line, and they explicitly state they only support IE and explicitly do not support Netscape/Mozilla. Since these filings are important I fire up IE for them.
>
>
>Run, don't walk, and get the free IETab plugin for FF. It allows you to select which sites require IE and it opens with IE in the FF tab instead of FF. Neat!

Well, for the few times I use IE, I find it just as simple to open a separate IE instance (leaving FF up) and just alt-tabbing between them.

I generally try to run with as few layers of software as necessary - so why run IE in an FF tab, when you can run it directly?