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On notera dans un article intitulé Add-ons can make the good browser even better. So how do Mozilla Firefox and Microsoft Internet Explorer add-ons compare?, la citation suivante :

Browser add-ons can significantly boost your browser’s functionality. Firefox add-ons tend to be free (and pretty easy to find), while add-ons for IE are often commercial products. The entire add-on experience is much more refined with Firefox; Microsoft has a lot of catching up to do. One factor limiting IE add-ons is the complexity. It’s a lot harder to build add-ons and the information on how to do it is somewhat lacking.