This: Fennec has better security configuration than Firefox about:config settings in regards to telemetry and whatnot.
Mull is also great! Even more secure and better at stopping phoning home, telemetry, and fingerprinting.
Though, Mull tends to break quite a few websites.
I use Mull, and switch to Fennec selectively when Mull doesn’t work
Fennec, which is a Firefox clone, because it allows (allowed) me more customization than the default Firefox.
This: Fennec has better security configuration than Firefox about:config settings in regards to telemetry and whatnot.
Mull is also great! Even more secure and better at stopping phoning home, telemetry, and fingerprinting. Though, Mull tends to break quite a few websites. I use Mull, and switch to Fennec selectively when Mull doesn’t work