For something similar, I use a Firefox docker container whose data settings are saved to the ephemeral disk which disappears once the browser closes. It's just

For something similar, I use a Firefox docker container whose data settings are saved to the ephemeral disk which disappears once the browser closes. It's just a standard Firefox (or Chrome, or Brave, or..) otherwise. I use the same mechanism - but with persisting user data - for things like banking etc. in which I only open that one site.