This is exactly the problem I was suggesting might be improved by an increase in browser diversity. 9/10 times, the issue isn't the browser itself, the issue is that the dev didn't bother to test and find the (handful of often small and easy to fix) bugs in other browsers. If they were forced to do QA - and ideally, had to adhere better to the actual standards to make their own jobs easier - you might have an easier time using those apps (and the libraries they depend on) in other browsers.