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Cursed: the evil "Allow websites to perform privacy-preserving ad measurement" exists in Firefox mobile not just desktop, but the UI to disable it is not present on mobile.

If you're using mainline mobile Firefox that blocks access to about:config, you need to use the roundabout way to get to it:

chrome://geckoview/content/config.xhtml

Then find dom.private-attribution.submission.enabled and change it to false.

Edit: Some folks have chimed in to say the default is false anyway, while other sources suggest it may be true by default. It's not clear where the default comes from, but horrifying either way that the setting/code is there with no UI to see if it's enabled or disable it.