This keeps happening over and over for Google at a rate far in excess of other major tech companies so we know they don’t make an effort to test with Firefox, and it’s why I’d like regulators to force anyone making a browser used by more than, say, 100k people to be obligated to test in other browsers on every site their larger organization operates and have a maximum time to patch any compatibility or performance issue which isn’t due to a browser not implementing a W3C standard. The goal would be to cover things like YouTube using the Chrome web component API for ages after the standard shipped and serving a slow polyfill to non-Chrome browsers.
