Firefox extension InstaClick makes up for your laptop's lack of a middle mouse button by re-mapping the right-click function to open links in a new tab.
Once the extension is installed, using right-click on any link will open it in a new tab. If you want to see the normal context menu for a link, simply hold down the Shift, Ctrl, or Alt keys while right-clicking on the link. There's no UI, preferences, or anything else—it just works exactly as advertised, and since it only applies when clicking a link, it's not very intrusive. Knowing how nice it can be to open links in a new tab with focus, having a proxy middle-click can be quite a handy tool when you're away from the mouse.
[via lifehacker]
