[ryankrage77]

Firefox V89 was last 'not actively terrible' version in my opinion. I've disabled updates and I'll continue using it until it breaks or becomes too insecure. At that point I'll jump ship to Waterfox or another browser.

Disabling updates was not straightforward. Settings in about:config and GPO are ignored, I had to create a policies.json as described here, https://support.mozilla.org/en-US/questions/1304175.

[RL_Quine]

That version almost certainly has exploitable CVEs. You can't just not update a browser.

[blacksmith_tb]

I don't think I'd personally suggest lagging behind any more than the ESR channel[1] does, for safety's sake.

1: https://support.mozilla.org/en-US/kb/choosing-firefox-update...