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Settings -> Privacy Uncheck the box labeled "Allow websites to perform privacy-preserving ad measurement". Easy peasy.

• addandsubtract 2y ago
  Ironically, searching for "Website Advertising Preferences" returns 0 results.
• wkat4242 2y ago
  Yes but this setting is not made available in the mobile app.
  • cpeterso 2y ago
    Because PPA is not enabled in Firefox Android at this time: https://bugzilla.mozilla.org/show_bug.cgi?id=1909729 https://bugzilla.mozilla.org/show_bug.cgi?id=1909729
    • wkat4242 2y ago
      Ah ok good. I see it is partly because there is no opt out UI. For some reason Mozilla is very sparse with settings and user freedom on the mobile app, for this reason I thought it might have been overlooked. It was also not clarified in the announcements at all. But good riddance. I hope it stays this way.