One thing which has always stopped me totally ignoring IE in my day-to-day doings is the fact that it doesn't load our intranet page (or any other page requiring NTLM authentication) without prompting me for my domain username and password.
In typical Firefox fashion, the solution was always there, right under my nose - someone pointed me to "about:config". Type "about:config" into the firefox address bar. Enter "ntlm" into the filter, you should see only two matching config options. Double-click "network.automatic-ntlm-auth.trusted-uris" and enter a (comma separated) list of machines (e.g. "intranet,timesheet") which prompt you for your domain credentials. Voila :-) Bye bye IE.
Explanation of some of the other options at Mozillazine
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