This is the first time where I got a visceral feeling that maybe this isn't the browser I knew and loved anymore. It's not like I'm uninstalling and switching to something else, but I do feel bummed out.
But as a Firefox user from the very beginning, I still keep tabs on it, hoping that it will improve enough for me to return to it. Things like this, however, strongly indicate to me that Firefox is just lost and will never find its way back.