So I haven't been following the Firefox thing that closely. Fennec isn't an alternative because it uses Firefox's Sync and Brave is out of the question because it's crypto Chrome?
Fennec is a poor alternative because it connects to Firefox services. Sync is optional, but some internal components will talk to Mozilla, and Mozilla changed their mind about "never selling your data" recently.
Brave is Chrome with a history of suspicious moves, toxic leadership, involvement with crypto and AI