[m_nyongesa]

XUL is still under development as UXP, by the Pale Moon community: https://repo.palemoon.org/MoonchildProductions/UXP

I'm not sure how they are dealing with documentation. Someone posted this link on Reddit's r/palemoon less than a year ago: https://udn.realityripple.com/docs/Archive/Add-ons/Overlay_E...