Orion (from Kagi) is a strong contender. It's not (yet) fully open-source, but Kagi has bona fides when it comes to privacy. Orion blocks trackers and ads by de

Orion (from Kagi) is a strong contender. It's not (yet) fully open-source, but Kagi has bona fides when it comes to privacy. Orion blocks trackers and ads by default, has no telemetry, and is designed to avoid sending any user data to its servers. Lower memory footprint and battery consumption (reportedly; citation needed). And it can run FF extensions.