As has been noted in many other blog posts, tweets, and so forth, the new Firefox addons developer guide has been posted. This is a great new resource for new add-on developers, starting with an introduction to the basic technologies behind add-on development, and progressing into actual development of extensions.
There are some to-do items left, including additions of screenshots and diagrams.
I’m working on a copy-edit pass to clean up the text a bit, as there are places where the fact that it’s a translation to English from its original Japanese is fairly obvious. I’m also doing some style tweaks to make it fit the style of MDC a bit better, from a visual standpoint.