Waterfox

Waterfox is a derivitave of Mozilla Firefox on legacy versions of software.

Firefox Derivatives
TenFourFox- like me but specific to OS X

Tor Browser

Basilisk

Pale Moon

K-Meleon

Retrozilla- Hey i do not want to support your older operating systems,stop blabbing about it.

Enemies
Mozilla Firefox- It's been too long, dad.