uBlock Origin Integration Investigation

Associated technical investigation for #17569

Open questions:

• appropriate uBlock-origin configuration for Tor Browser
• appropriate UX integration in Tor Browser (i.e. to what level do we want to hide it from the user like with NoScript)
• mitigating fingerprinting issues
  • can we match Mullvad Browser's fingerprint
• Tails' needs
• self-hosted add-on hosting
• upstream changes needed from gorhill
  • should we invite them to our gitlab
• edit: https://gitlab.torproject.org/tpo/applications/team/-/wikis/Goteburg-2023-Meeting-Notes/ublock-origin

/cc @intrigeri @donuts @ruihildt @thorin