Вот несколько альтернатив Mozilla Firefox с открытым исходным кодом:

LibreWolf (Windows, macOS, Linux)

Water-fox (Windows, macOS, Linux)

Tor Browser (Windows, macOS, Linux, Android)

Pale Moon (Windows, Linux)

Basilisk (Windows, Linux)

K-Meleon (Windows)

Midori (Windows, macOS, Linux)

SeaMonkey (Windows, macOS, Linux)

Floorp (Windows, macOS, Linux)

CometBird (Windows)

IceDragon (Windows)

Flock (Windows, macOS, Linux)

Capyloon (Windows, macOS, Linux)

Ladybird (Windows, macOS, Linux, Android)

QupZilla (Windows, macOS, Linux)

Zen Browser (Windows, macOS, Linux)

Comodo IceDragon (Windows)

Otter Browser (Windows, macOS, Linux)