Looking to get into developing firefox addons: Help with useful learning resources available?

As per the topic title, looking for useful resources and general advice before starting add-on development proper! Thanks!

The official resource to learn about add-on development is https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/What_are_WebExtensions

As the very start notes, you’ll want to know web technologies like JS, HTML and CSS. To learn these, you could start at https://developer.mozilla.org/en-US/docs/Learn

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Also check out this nice overview site: