For what it's worth, Mozilla has done Electron-on-Gecko at least twice (several years before Electron), and Electron-on-Servo at least once. There was brief in

For what it's worth, Mozilla has done Electron-on-Gecko at least twice (several years before Electron), and Electron-on-Servo at least once. There was brief interest by the community, and a few applications were written to take advantage of it, but it didn't last.