> Nyxt is web engine agnostic. We utilize a minimal API to interface to any web engine. This makes us flexible and resilient to changes in the web landscape. Currently, we support WebKit and WebEngine (Blink).
Well, it depends how Nyxt works, if it wraps entire browsers or just web engines. Also, Gecko isn't a separate component/library to Firefox so they would have to do major surgery on Firefox to extract Gecko.