Keyboard shortcuts
Open links in a new tab in the background  CTRL+click  
Open links in a new tab in the foreground  CTRL+SHIFT+click  
Open a new tab in the foreground  CTRL+T  
Open a new tab from the address bar  ALT+ENTER  
Open a new tab from the Toolbar Search Box  ALT+ENTER  
Open Quick Tabs (thumbnail view)  CTRL+Q  
Switch between tabs  CTRL+TAB/CTRL+SHIFT+TAB  
Switch to a specific tab number  CTRL+n (n can be 1-8)  
Switch to the last tab  CTRL+9  
Close current tab  CTRL+W  
Close all tabs  ALT+F4  
Close other tabs  CTRL+Alt+F4  

Mouse shortcuts
Open a link in a background tab  Middle mouse button on a link  
Open a new tab  Double click on empty tab row space  
Close a tab  Middle mouse button on the tab