Capyloon mobile Web-based OS works on Pinephone Pro, Librem 5, Pixel 3a - CNX Software
www.cnx-software.com
Capyloon is an experimental Web-based OS leveraging b2gOS that served as the base for the now-defunct Firefox OS. The developers' goal is to provide an

Looks like someone is trying to revive FirefoxOS properly (not like KaiOS).