I just tried this browser can say it is faster than Firefox. It does not have sync but supports crucial addons plus you can add your own list of addons like you do on Firefox Nightly. Sadly, I couldn’t see an option to block 3rd party cookies; since this is just an alpha/early beta release it is normal. It is a very interesting project.

According to their readme page:

Biscuit Browser is a GeckoView-based web browser for Android with extension support, no telemetry and advanced privacy features.

Github repo: https://github.com/CookieJarApps/BiscuitBrowser

Downloads page: https://github.com/CookieJarApps/BiscuitBrowser/releases