This extension is for those who use a mouse with only three buttons. (primary, secondary and wheel) With other input devices such as 5-button mouse or Apple's trackpad and magic mouse, navigating pages (Go back/forward) in the browser is seamless. This extension solves problem for easy navigation with a 3-button mouse. Just like swiping the trackpad to go back/forward, user can wheel-click then drag horizontally to go back/forward. (Drag to the right - Go Back a Page, Drag to the left - Go Forward a Page) User has options to change the drag threshold length (in pixels). (e.g. if user wants dragging to be shorter, they can change settings in options page) The source code for this extension can be found at https://github.com/j-shim/drag-to-go-back.