If you need to develop an extension for a browser, you will definitelly develop for Mozilla products: easy, low-cost, and low-tech.
For IE, you need: Visual Studio 2005, and learn C++… and registry touches, and COM and…
For Firefox, open Notepad, save as .xul, edit an .rdf, know some JS, pack them as .xpi, install it, and:
Hello World!
IE, please, don’t hurt the web.
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