MDN is what I've used in the past: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions https://developer.mozilla.org/en-US/docs/Mozilla/Add-

MDN is what I've used in the past: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web... https://github.com/mdn/webextensions-examples https://github.com/mdn/webextensions-examples