Librewolf
Often regarded as the most secure and private, but recommended for more technical users
Features
Non-Google Engine
Isn't impacted by Google's decisions e.g. dropping support for ad-blocking extensions
Zero Telemetry
Limited or no telemetry (tracking or analytical data) is reported back to the company
Built-in Ad Blocker
Default installation comes with an ad-blocker built-in or a preconfigured ad-blocking extension
Platforms
Windows
Compatible with Windows operating systems
Mac OS
Compatible with macOS computers
Linux
Compatible with Linux operating systems