No worries, I didn't take it that way.

Mine injects some functionality in a specific government website that I frequently use so it's a very narrow use-case anyway. I only published it "because why not". Not going to link it because I did so under my real name to be able to add it to my CV.

The main thing I had to wrap my head around was the difference between content and background scripts. Other than that, of course, reading the steps to publish the add-on at Mozilla.