Press the ctrl key when left clicking on the link for a new background tab (middle clicking creates a new background tab also) ctrl shift when clicking on the link for a new foreground tab (shift middle click also works). For extensions to try, here's an Opera extension, Open New Tab. If you hold your click a bit longer, you get the new tab. And here's a chrome extension, Click to Tab. Remember, to download a Chrome extension easily, you need the Opera extension, called Download Chrome Extension, or Extension Source Viewer,