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I want to create an extension that can manipulate or look at cookies in the browser. Also, I want to be able to parse every page you visit and replace some URLs.

So here is the question: What is the language? Does it have the reach I need? Will it work smoothly?

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Firefox extensions are created using a mix of XUL (XML User Interface Language) and Javascript.

You'll find plenty of explanation on the Mozilla Developer Center.

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