And that’s a bad thing, and the people involved in making those sites should feel bad and do something about their mistakes rather than just shrug. And we should call them what they are: Mistakes, abuses of the web.
Firefox isn't doing so well on market share, and appearing to be broken isn't going to help.
Changing the latter costs money - time from people’s lives.
Why?
You’ve given no argument that this actually is “abuse”