4 ms·

Firefox, Thunderbird (and their spin offs) were all considered serious desktop apps. They all were written with XPFE/XULRunner.

• TeMPOraL 8y ago
  They didn't advertise that much, though. I only learned about XULRunner when I was trying out a keyboard-driven browser (Conkeror). Unlike Electron, XUL wasn't promoted.
  • zmix 8y ago
    And that is the main reason, IMO. Mozilla Inc. never wanted to do more with it.