I think I reached this point many months ago:
My Firefox browser just “updated” to 57. I promptly backdated it to 56.0.2 and turned off automatic updates.
I have a bunch of add-ons I use with Firefox — one of which is essential for the way I publish this blog — and the browser’s new paradigm has already ruined one of them. 57 broke another and I’ve had enough. The aforementioned extension that enables me to publish the Tally Book conveniently would be one of those I’d lose with 57, so 57 simply had to go.
I grew weary of Firefox’s feeping creaturism about the time they told me I really needed the tabs to be moved, because reasons. I then installed the Pale Moon browser, version 24.4.2, and set it up to look as much like the last Firefox version I could stand. Now at 27.6, it still looks like that long-ago-forgotten Firefox, though most of the code, originally a fork of Mozilla’s, has been rewritten, and a whole new rendering engine has been shoved under the hood. It has a couple of quirks, but so what else is new?