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Firefox used to be extremely extensible: there were some software based on Gecko and Xulrunner. However, they all died out after Chromium and Electron took over.

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Xulrunner specifically, died or at least is not easily revived, because Mozilla killed XUL and XPCOM.

There was even an Oreilly book about it: https://learning.oreilly.com/library/view/programming-firefo...

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