I've been using FF since Netscape, and it used to be a few settings and we're off. Now, you have to edit policies.json to get updates stopped, autoconfig.js and firefox.cfg to disable telemetry, legacyUserProfileCustomizations to use userChrome.css to get anything like a proper menu system.
'Lockwise' has dumbed down the login system so much you can't even change field names, making many sites incompatible. Nor can you import logins from file or even point to installations to import. The add-ons system is like traveling back in time ten years, bugs and fewer alternatives than ever, still can't figure out how to stop Tree Style Tabs from stealing mouse focus from the page onmouseover like a widget. -And these are problems that were fixed before they were reinvented.
For the first time in 16 years I'm seriously trying alternatives.
-these were my views on 83, i hope to hell 84 fixes some of them.