Browser using the Gecko layout engine to render web pages, which implements current and anticipated web standards.

Fennec F-Droid is based on the latest Firefox release. It's focused on removing any proprietary bits found in official Mozilla's builds. There might still be some binaries left and the app (or some builds) might get removed or re-pushed anytime.

From version Fennec F-Droid 81.1.5:
(x86) (Android 4.1+)
Latest: 68.12.0 on September 21, 2020
All versions
October 15, 2020
October 2, 2020
April 16, 2020
March 19, 2020
March 11, 2020
August 18, 2019