People forget that the next step of Google will be the inconvenience. Meaning they'll make Firefox work badly on YouTube and other google websites. Have a video not play here, bad css layout there. Subtle stuff that will make people hate to use Firefox and because Google is dictating the Web standards, they will do so, in fact they actually already do. I've already had a few websites using some kind of PWA framework, that was horribly slow on Firefox compared to Chromium based browser.