In case you're using Firefox on mobile - so myself and like four others - disabling Firefox' new Facebook data collection feature is quite a bit harder than on desktop, but it can be done:

  • Go to chrome://geckoview/content/config.xhtml
  • Use the search field to find the entry for aboutConfig and enable it
  • Go to about:config
  • Search for dom.private-attribution.submission.enabled and set it to false
  • Done. This only works on Android, because Firefox on iOS is just a Safari skin.

    @thomholwerda thank you so much ive just looked for it in the settings but couldn't find it so figured maybe they didn't implement it on phones. putting this opt out option out of sight is really a shame.
    @datafuzz @thomholwerda try to search for aboutConfig without the colon