There's been some renewed interest in this direction, at least on Android, in the form of GeckoView: https://bugzilla.mozilla.org/show_bug.cgi?id=1322573 https:

There's been some renewed interest in this direction, at least on Android, in the form of GeckoView: https://bugzilla.mozilla.org/show_bug.cgi?id=1322573 https://bugzilla.mozilla.org/show_bug.cgi?id=1322573 Servo, Mozilla Research's next-generation parallel browser engine, also has embedding as an explicit top-level goal: https://servo.org/ https://servo.org/