Browser Plugin Development [closed]

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I want to develop plugins and extensions for browsers like in the Chrome web store, but I do not know where to get started. Can anyone suggest anything?

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You'll need knowledge of HTML, CSS, and JavaScript.

Then, you can start here.

Resources

Getting Started (Hello World! extension)
Chrome Developer's Guide
Chrome APIs

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Depends on which browser you want to extend. Then find tutorials, documentation, existing opensource extensions and code, code and code..

For chrome here is extension tutorial, start there..