GNUzilla and IceCat - GNU version of Mozilla suite and Firefox ESR: https://gnu.org/s/gnuzilla | Savannah: https://savannah.gnu.org/projects/gnuzilla | Free Software Directory: https://directory.fsf.org/wiki/IceCat | WebExtensions: https://directory.fsf.org/wiki/Collection:IceCat_WebExtensions_(proposed) | Website incompatibilities: https://github.com/davidhedlund/WILBE