Have you considered other approaches, such as Tailscale or Cloudflare Tunnels? I think you’re complicating things.

I have some SmartThings plugs that work similarly, I think they have a UK version.

TubeArchivist sounds like a better fit for that.

You can use lists in Readarr. Set up a Goodreads account, link Readarr to a list in Goodreads. Any books in the list will automatically be added to Readarr.

Dark mode?

I’ve had similar experiences with FF and HA. I tried everything that has been suggested to you and kept having problems. In the end I installed Brave just for HA. I still use FF for everything else.

You can head over to the ArchiveTeam Warrior site for more info. You can set up a Warrior instance in Docker and assign it to the Reddit archive project.