The animal in Firefox is not actually a fox!

It's actually a red panda! Slightly larger than a domestic cat, the red panda is native to the Himalayas and western China.

Many assume that the animal in the Firefox logo is a fox, yet Firefox is actually the nickname for the rare panda species.

Eating mostly bamboo, it is currently classified as "vulnerable" by IUCN because of it's dwindling population.

(Source)