There are several sites which can only be viewed correctly with the Internet Explorer, e. g. the Windows update site. IE Tab has a list with such sites, and if you go to a “site for IE”, it switches to the IE engine.

ietab tool fx2ie IE Tab   open IE sites in Firefox

You can download IE Tab for free at mozdev.org:
http://ietab.mozdev.org/

What do you think? Do you often visit these sites?

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