TenFourFox

TenFourFox is a browser emulating Mozilla Firefox on Mac OS X. The retains Firefox's features after Mozilla announced that Firefox would no longer support Mac OS X releases.

Firefox Derivatives
Tor Browser

Waterfox

Basilisk

Pale Moon

K-Meleon

Enemies
Mozilla Firefox- WHY DID YOU LEAVE ME TO DIE???

Mac OS X- Good to me once, but abandoned me in passing.