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What are extensions? - Mozilla | MDN
https://developer.mozilla.org/docs/mozilla/add-ons/webextensions/what_are_webextensions
“An extension adds features and functions to a browser. It's created using familiar web-based technologies — HTML, CSS, and JavaScript. It can take advantage of the same web APIs as JavaScript on a web page, but an extension also has access to its own set of JavaScript APIs. This means that you can do a lot more in...” (the page’s own description)
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