Well, the bizarre collection workaround is present in Beta and Nightly releases as well, and is intentionally well hidden. It also allows installing/uninstalling extensions quickly when testing on multiple devices, or sharing extension collections with testers. It is indeed needlessly convoluted for users but I would not describe the workaround as dumbass if it works well for the intended audience. You are correct, plenty of Firefox’s advantages can only be achieved by modifying the settings from defaults, often through developers’ hacky about:config keys. Mozilla thinks that mass adoption and their financial security is only possible if they make a noob-friendly browser with a few big buttons and Google search so tech-savvy people need to jump through hoops (profile importing etc.) to quickly set up the browser to their liking.