You can click right mouse button on link and then select "Open in new window" - new tab will open. Number of tabs is unlimited. In this tab you can go to whatever site you want - on top of site is the place for type url(almost like in standard internet browser). When browsing in this tab you can also click middle mouse to open links in new tabs. To close tab just click middle mouse on it or just right click and select "Close" menu option.