Collections by musichemyst
AMO's Cream of the Crop: Past & Present by musichemyst
Be it the latest beta or an old copy v3.x, if you'd like to tweak, soup up, or heavily mod Firefox, then there's likely a solution in this list that I've been carefully fine-tuning over the years.
Create a New Collection
Collections make it easy to keep track of favorite add-ons and share your perfectly customized browser with others.
Create a CollectionTo create your own collections, you must have a Mozilla Add-ons account.