Found it. Go to settings, type privacy into the search box. The last item under "Firefox Data Collection and Use" is a check box labelled "Allow websites to perform privacy-preserving ad measurement".
It was already unchecked on mine when I looked just now.
open chrome://geckoview/content/config.xhtml, set general.aboutConfig.enable to true
open about:config, set dom.private-attribution.submission.enabled to false
dom.private-attribution.submission.enabled
I guess the question is whether the aggregation services can be persuaded by clever attribute manipulation to give the ad site a near unique report for a user across many sites.
<https://support.mozilla.org/en-US/kb/privacy-preserving-attr...>
<https://datatracker.ietf.org/doc/html/draft-ietf-ppm-dap>
<https://github.com/mozilla/explainers/tree/main/ppa-experime...>
programs.firefox.policies.Preferences."dom.private-attribution.submission.enabled" = false;
I know of no workaround short of installing from the Beta or Nightly channel.
source: https://connect.mozilla.org/t5/ideas/firefox-for-android-abo...
And then you can go to the normal about:config and set dom.private-attribution.submission.enabled to false
Only then is PPA actually off (apparently, I did not manage to test this yet but someone did confirm the default setting is true). Not cool. Especially because Mozilla provides instructions for the desktop version on their site but doesn't even mention the mobile version at all.
128.0 (Build #2016030615)
Wonder why this is even an issue.
And it felt kinda good, i actually thought that Firefox was different and a part of "the good guys", now it doesn't feel that way anymore. Sigh.
Maybe one day we'll have a usable FOSS browser but I doubt it (the companies will fight tooth and nail against it including legal means, buying out companies, blocking content for them, etc.).