A fine example of an add-on (extension) that should never have been written in the first place. If you need to run IE, then run IE - while putting pressure on the site/page/app developer to remove their reliance on IE and/or ActiveX.
Why on earth should I be forced to fire up IE just because I
need to use a brain dead web app ? Having IE Tab makes life so much more convenient when you
have to have IE to make something work.
As to putting pressure on the app/site, that can be a very long wait when it is your bank or employer's site/app. Thankfully only one of my three banking websites needs IE now.