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Robert Walker
Okay, I don't know too much about this, but you can build "plugins" that interact with the browser, e.g. to create toolbars and such like.

Plug-in (computing)

They don't really run "in" your browser in the same way as a javascript or java program, but instead collaborate with it.

Basically they are seperate programs that get started up by the web browser

Sorry - that's not a really good answer as I haven't had to develop browser plugins myself and only have a basic understanding of what they do and how they work but it's enough to see how they can be written in any language - as they are binary code that's executed by the browser.

About the Author

Robert Walker

Robert Walker

Writer of articles on Mars and Space issues - Software Developer of Tune Smithy, Bounce Metronome etc.
Studied at Wolfson College, Oxford
Lives in Isle of Mull
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