In spite of Google’s share, the fact that you still need to go download a browser means it isn’t over. The barrier for entry is no higher for Firefox vs Chrome, and to the average user, they’re not differentiated - you could change the icon and they’d be none the wiser.
Google using their functional monopoly on search and streaming to entrench their functional monopoly on the browser in a way that’ll give them meaningful control of the way the Internet operates isn’t something we should just roll over on.