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You also say that FF uses this data for "features that do not serve the user in any meaningful way." I argue this isn't true - all data sent back is used for your security to update your blocklists, for your convenience to pre-load websites, or for Mozilla to know how to continue developing the browser (which is the most straight-forward to disable). They (say that they) don't use any of the data for monetary gain: ** Mozilla never shares data with any third party.** (this is also the source you linked in the OP).
It may be true that browsing about:addons (as described in the cited source) pings Google analytics (untested by me), but the source bug report also links to this description of legal contracts between Mozilla and Google that clearly show that Google is prevented from mining or sharing this data. Google may stil have access to the data (couldn't find a reference), but I'm sure UBO has a thing or two to say about that.
Librewolf, pretty much firefox without mozilla. It also comes with a lot more hardening by default than firefox.