To begin with, they need to offer a 5x reduction in RAM usage. Then they need to offer all the tools Opera offers like integrated messaging apps, custom screenshot utility with the ability to capture a VERY long page at once, integrated adblocker, etc, to convince me to go back after almost a dacade away from this browser. Extensions are something pretty much all browsers have, and considering most browsers these days are chromium based you have a pretty good chance of getting a Chrome extension to work on a different browser. I've never had one that didn't work on opera to this day. So...