Firenewts are relatives to lizardfolk, but their environment and behaviour is different enough for them to be confused with salamanders. Unlike lizardfolk, firenewts thrive in environments of extreme heat, with some tribes even living near or in active volcanos. Oftentimes, a creature so comfortable with fire would be a native of the Plane of Fire, but firenewts are completely native to the Material Plane.
Firenewts are extremely aggressive to both other firenewts and non-humanoid races. If a warband of these creatures is spotted, it's a sure thing that they're participating in a raid, possibly to smash the eggs of another firenewt tribe. They're also a highly religious people, with the most important members of society often being clerics in service to evil fire gods.