It's pretty grim for Ff, but our real doom starts when they pull an Android and bundle lots of non-redistributable components to cut off their real competition, the Chromium clones. It'll be like Play Services in the aftermath of the Kindle Fire all over again, probably under the guise of Flutter and AMP.
Isn't there already something of this sort happening with DRM components? There was a story on here recently about someone whose Chromium-based browser was locked out of the video streaming addons. To be fair, that was more by the video streaming plugin developer than by Google, but it was still an example of undermining the open source portion of the product.