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That's a pretty heavy ask. The CEF is very closely tied to the internals of chromium. That said, it would be beneficial if they had a similar framework that could be used as an alternative.

I thought the whole point was to be an alternative to CEF?

Why must Firefox support CEF? To encourage more Firefox forks?

In general, providing embedding support helps your web runtime being used more widely.

In the case of CEF, it's a quite old and not very modern embedding API, so I would tread lightly. On Android Gecko is easy to embed using the GeckoView component, but I have no idea if it's successfully used in non-Mozilla projects.