I looked at downloading PM but they are only for Windows and I use Linux. Looks like a good browser though.
Pale Moon is also available for Linux, in some cases pre-built. In other cases (distros) you will have to compile it yourself.
There is a Linux version out.. but I am running the Win version on my Linux until they put it in a Linux repository (WINE).
Works fine on wine, and, as a matter of fact, adds another layer of security :D