loadGroup( group )
Not in Firefox
Return type: the first tab
Loads a group of pages into multiple tabs. They are either appended or replaced depending on the state of the preference browser.tabs.loadGroup. The argument should be an array of objects, one for each document to load. The objects may be defined in script and contain a URI property for the URL of the page to load. A referrerURI property may also be optionally used to set the referrer page. This function returns a reference to the first tab loaded.