Not to discredit your experiences with Linux but you just listed Ubuntu four times

My understanding is that Fennec only removes Mozilla’s telemetry, whereas IronFox (forked from the discontinued Mull) is that plus patches to further harden the browser.

IronFox is available through F-Droid via the project’s own repository, but is recommended to install through Accrescent, which you can learn more about here.

“Copilot, analyze player xXWaterUnderYourMumsBridge4201Xx to determine what would be the most accurate slur to call them”

Not the person you responded to but as a former Brave user, I’ve been very satisfied with LibreWolf on desktop, and IronFox on Android.