No kidding. I had to create a Google Doc document to remember all the little things that I have to clobber in Firefox to make it behave reasonably. Here is an excerpt of how I clobber the defaults:

  - Enable pixel-perfect smooth scrolling (Linux): MOZ_USE_XINPUT2=1 (why do we still have to do this??)
  - Enable: Ctrl-Tab cycles through recent used order
  - Disable: "Show an image preview when you hover on a tab"
  - Disable: "Use AI to suggest tabs and a name for tab group"
  - Disable: "Enable Picture-in-Picture video controls"
  - Disable: "Control media via keyboard, headset, or virtual interface"
  - Disable: "Recommend extensions as you browse"
  - Disable: "Recommend features as you browse"
  - Disable: "Enable link previews"
  - Homepage and new windows: Blank page
  - New tabs: Blank page
  - Disable: Web Search
  - Disable: Weather
  - Disable: Shortcuts
  - Disable: Recommended stories
  - Disable: Support Firefox
  - Disable: "Save and autofill payment info"
  - Disable: "Save and autofill addresses"
  - Disable: "Ask to save passwords"
  - Locations: Select "Block new requests asking to access your location"
  - Notification: Select "Block new requests asking to allow notifications"
  - Autoplay: Select "Block Audio and Video"
  - Virtual Reality: Select "Block new requests asking to access your virtual reality devices"
  - Default Search engine: DuckDuckGo
  - Disable "Suggest search engines to use"
  - Disable "Quick actions"
  - Disable "Suggestions from Firefox"
  - Disable: "Title Bar"
  - Default Zoom: 110%, 120%, depending on the laptop

And I install the following extensions:

  - uBlock Origin
  - Privacy Badger
  - Facebook Container
  - Firefox Multi-account Container