It's also worth emphasizing that it isn't difficult to support Firefox. I'm pretty sure that many of the sites that I visit do so largely by accident. I do a fair bit of web development, and Firefox/Chrome compatibility has never been an issue in the slightest for me. You almost have to go out of your way to choose Chrome-specific APIs in order to break compatibility. How does virtually every other website on the internet manage it—from my bank to scrappy startups with junior developers coming straight out of bootcamps—while Google with all of their engineering talent and $100+ billion cash on hand just can't seem to make it work?