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Comment by Tsiklon | Hacker News Reader

Perhaps more generously, to Firefox, they’re interpreting Firefox user strings as an app sending data to them. For curiosity, where did you pull that data from?

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See https://www.facebook.com/off_facebook_activity

What's the equivalent for people who don't have Facebook accounts? I presume data about me has been sent to Facebook despite that fact.

It‘s called shadow accounts. This is an article explaining the basic gist: https://www.howtogeek.com/768652/what-are-facebook-shadow-pr...

Thank you for sharing.

I can see it as well. I don't understand it either. I use facebook container on the desktop. Perhaps it is on Android or iPhone? I would also like to know what data Firefox shared with Facebook about me.

https://i.imgur.com/w8h9HeS.png

If you follow the trail of links (or directly go to https://www.facebook.com/dyi), you can request a detailed report. I have my doubts about on how complete this is, but in my case, the only thing I saw from Firefox were ACTIVATE_APP events; based on the timestamps almost definitely all from my phone.

Maybe it detects you using facebook container and infers you use firefox from that? Mine doesn't show anything firefox related, using ublock origin everywhere.

> Maybe it detects you using facebook container and infers you use firefox from that?

Not sure. I have used Facebook since then as well but the last sent date was end of March...

What Chrome extension do I have to enable to make it so Facebook doesn't know this level of data?

Edit: looks like https://privacybadger.org/ or https://ublockorigin.com/

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