I worry that Mozilla will copy the API changes ("for compatibility!") and disable ublock on Firefox too, as Mozilla gets most of their funding from advertising companies too.
If the new API get's ported (which is likely to happen), it does not mean the existing API will get crippled. After all, they are different implementations and it's Mozilla who's behind that. I trust them to not deprecate the old API until all use cases, especially concerning privacy, are taken care of in the appropriate way.
