I can't speak for everyone, but as a certified Firefox Preferrer my concern is this: One day I will update my browser (after putting it off for a few days sinc

I can't speak for everyone, but as a certified Firefox Preferrer my concern is this: One day I will update my browser (after putting it off for a few days since the "restart Firefox to apply updates" button appears) and my user chrome will be moved around to make room for some new star/diamond-shaped button or additional side-panel, then I'll have to dig around in the settings or about:config to disable it and maybe even tweak my userChrome.css to accommodate it. From then on my list of things to do every time I set up Firefox on a new device will be one item longer, and I will feel ever more like my core tools do not have my interests at heart as I have to hack away at extraneous bits and pop open the hood to fiddle with knobs to get them to work normally without looking like a billboard for useless and half-abandoned features.