Embedlite is still maintained, even though it's not a Mozilla project nor very active. Since it's the base for the Sailfish browser, it even does have Qt bindi

Embedlite is still maintained, even though it's not a Mozilla project nor very active. Since it's the base for the Sailfish browser, it even does have Qt bindings. Relevant repos: https://github.com/sailfishos/qtmozembed https://github.com/sailfishos/qtmozembed https://github.com/sailfishos/embedlite-components https://github.com/sailfishos/embedlite-components https://github.com/sailfishos/gecko-dev https://github.com/sailfishos/gecko-dev