I just want things to work without much fuss. So I'm not exactly enamored by all the features you have described.
I had been a Firefox user for years. Then, about six months ago, Firefox began crashing on me for no reason. It seemed it fell apart on my fourth or fifth website I visited. Restart, it worked for another four or five websites, then crash.
I uninstalled and reinstalled. Same thing. I suspected a virus deliberately designed to disable Firefox, but a quick search could not support this hypothesis.
I went to Chrome. I would like to go to Firefox for the reason that FF has no interest in my data.