What Browser Do You Use?

At the moment i'm testing the latest version of Vivaldi (Developed by Opera's Co-Owner). Works fine, not yet in a RC you might call "Full" as it's incompatible with other stuff like Popups and that kind of thigs. Uses a Chrome base to install extensions from the Chrome Store and is built in HTML5, CSS3, Node.JS and a variety of NPM Modules if i remember well.

One thing that i have to admit is that it has tons of personalization opportunities.