VanillaOrchids made a comprehensive tutorial of how she made her new theme, “In To Space” – check it out! http://vanillaorchidstutorials.blogspot.com/2015/11/mozilla-themes-focal-point-sizing.html
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Wow this is pretty in-depth. Good for beginners because of the screenshots - I think I can make one now too after reading that!
I think devs use documentation more then forums - this should definitely be linked from the MDN article on creating themes. Do we have one of those on MDN?