Almost all of have used Opera web browser. The Opera web browser used to be popular specially on mobile platforms. It’s still not given up and recently released some features in the latest release. But today in this article, we’re going to talk to the former CEO and present co-founder of Vivaldi web browser, Jon S. von Tetzchner , a browser that is for power users. Let’s ask him why he left Opera and why he started Vivaldi.