this post was submitted on 23 Jul 2025
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I don't think it strips UTM parameters specifically - I think it's limited to parameters that track you individually?
Hmm, apparently this is the list of parameters it strips: https://searchfox.org/mozilla-release/source/toolkit/components/antitracking/StripOnShareLists/LGPL/StripOnShareLGPL.json
So, yeah, it's only some of the UTM parameters (+ some non-UTM parameters).
And you brought the receipts too :) Indeed, looks like it's blocking the ones that might potentially identify you, not more generic ones (like
utm_content=top_banner
or whatever).