IE tabs
IEtabs is here:
https://addons.mozilla.org/en-US/firefox/addon/1419
One installed, you can right click the tab in firefox and click 'switch rendering engine' and it will toggle to IE. Hit it again and it will go back to firefox.
You can also set it to always use IE for zone by going into settings by going to the tools pulldown, IEtabs option than adding the HZ to the site filters by cutting the URL into it.
That's about as simple of instructions I can give.
Good luck.