// ==UserScript==
// @name          Open URL Background
// @description   Open URL Background
// ==/UserScript==
 
document.addEventListener ("keydown", function(event){
        if(event.shiftKey && event.keyCode == 65){
            openNewBackgroundTab();
        }
    }, false);
 
function openNewBackgroundTab(){
    var a = document.createElement("a");
    a.href = "http://www.google.com";
    var evt = document.createEvent("MouseEvents");
    //the tenth parameter of initMouseEvent sets ctrl key
    evt.initMouseEvent("click", true, true, window, 0, 0, 0, 0, 0,
                                true, false, false, false, 0, null);
    a.dispatchEvent(evt);
}