New Mozilla hub is targeted at small-app coders, so I couldn't help thinking about certain donation coders... you know, like the ones who are likely to be reading this post, right now...:, coders, like YOU!
https://addons.mozilla.org/developers :
Welcome to the new Developer Hub (beta)!
This will soon be the home of great add-on development resources like tutorials, documentation, and tools. Our content isn't available in all locales during our beta period, but you can still access the localized Developer Tools to manage any add-ons already hosted here.
Are You Ready to Make Browsing Better?
Add-ons empower millions of Firefox users to personalize their browser's form and function. Why not show off your smarts by creating an add-on the whole world can use? Tools and tutorials you find here make it simple. So take a look and put your ingenuity in motion.
Learn & Explore
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How-to Library
Get add-on development guidance in a top-notch collection of tutorials, articles, and more.
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API & Language Reference
The official documentation on APIs and languages. What you need, when you need it, to create your masterpiece.
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Case Studies
Start-to-finish success stories. See how add-on developers made magic with Mozilla.
Create & Connect
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Developer Forums
Discuss development, ideas, and make key connection in the world of add-ons.
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Add-on Builder
Auto-generate add-on packaging by entering basic info and picking UI parts. Get working without setup.
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Add-on Validator
Check your add-on for common problems and errors. Open to anyone, not just add-ons hosted here.
https://addons.mozilla.org/developers 
