content: Well, the speed is a big factor of it for me. It just seems to run better than vanilla Firefox or some of the other variants. They also made it a point to fork away from Australis-era Firefox and keep features of the old UI that a lot of people loved. Some addons are a bit weird with Pale Moon but for the most part there's support for them. I run it with uBlock origin and some of the other popular privacy addons and it runs just fine. It's pretty much older Firefox but still actively maintained with no intervention or interaction from Mozilla themselves