Here’s a quick 2AM post on how to use Internet Explorer in Firefox as a tab.
First, go to your Firewall application and deny Internet Explorer for incoming and outgoing network traffic. This will protect you against malicious IE hackers.
Now, simply right click and select “View page in IE Tab” for any website you need to use IE.
I like this extension simply because I can view SiteHoppin in Firefox and IE without opening up 2 browsers.