Open in IE - This is a little add-ons that enables you to open a link in a new Internet Explorer Window. Even though Firefox is by far the best browser I have used, but not all sites can function well in Firefox.
So instead of copying the link and paste it in Internet Explorer, all you have to do is right-click on a link, and choose "Open Link in IE". This add-ons works well for Firefox 1.5 - 3.6.*. Here is the link.