I am uninstalling Firefox after 16 years of sustained everyday use in dual-browser split setup alongside Safari. I will also make sure everyone I know still using FF gets the note.
I am going back to Chromium-based browsers that are openly "sell-your-data" from day 1 and I am willing to accept the Google monopoly if it means that dung beetles like Firefox are not able to prey on loyal supporters by bait-and-switching the ToS whenever they feel like. Hopefully their telemetry shows them a good picture of how their decisions affect their market share.
Hell, my 2011 issue about wrong handling of ::first-letter pseudoclass on bugzilla hasn't got a single meaningful update since, but I was willing to sacrifice the standards compliance for the promise of "privacy". There is no more privacy.