Fennec F-Droid

Wide collection of addons, including ad blockers.

Improved tracking protection.

Private mode available in a single tap.

Customizable start screen layout and navigation bar position (top or bottom).

Dark theme.

Collections of tabs.

Synchronization of tabs, bookmarks, passwords, etc. across multiple devices via Firefox Sync.

Picture-in-picture mode.

Fennec F-Droid browser is based on the latest Mozilla Firefox release. It has proprietary bits and telemetry removed, but still connects to various Mozilla services that can track users.