Firefox plugins and XUL

Writing XUL is a giant pain in the ass and the documentation is lacking any examples.
Here is a good resource

Excerpt from that page

There is a list of some resources here … ng-started

This tutorial is quite a helpful introduction … Extensions

I generally just use MDC (Mozilla Developer Center) for reference (just keep an eye on what version of Firefox/Gecko the documentation applies to)

The XUL periodic table is a helpful resource for basic XUL element layout

W3Schools is a useful basic reference for DOM and Javascript

There is a list of the Mozilla interfaces here

The DOM inspector is a “must have”

Anyway that’s just a few that you might find useful