[BugWatch]

Could anyone suggest a good resources/guides/tutorials/books for writing Firefox add-ons?

I remember making a cursory search a year ago, and hardly found anything remarkable. (Might have been a case of Google's-bad-search-results syndrome.)

[nitrohorse]

MDN is what I've used in the past:

https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web...

https://github.com/mdn/webextensions-examples

[azeirah]

Oddly enough, MDN is a far superior resource for manifest V3 than Google's own documentation.

This is really odd because Firefox doesn't even have a manifest V3 implementation yet.

Anyway, to answer your question, MDN is for sure the place to go.