It's a new game now.
Micro$oft have realized that the old adage "whoever controls the browser, controls the Internet" is no longer true. It might not have ever been true. Micro$oft no longer cares what browser you're running as long as you pay them monthly for cloud services like Office 365 and/or Azure.
So if they're going to pull any dirty tricks, it'll be to shift as much of your workload into their cloud, whether you want to or not. Look for mandatory logins to their cloud, which they push you to already, but it's going to get even more draconian.