boostraped extension - autoscroll:start

var {classes: Cc, interfaces: Ci, utils: Cu} = Components;

Cu.import("resource://gre/modules/Services.jsm");

// called by aWindow.addEventListener("click", clicker, true);
var clicker = function(e) {
    let aWindow = this.window;

    // middle click
    if( e.button === 1 ) {
        e.stopPropagation();
        runAction(e, aWindow);
    } else return false;
};

var runAction = function(e, aWindow) {
    // initial, it used to work
    aWindow.gBrowser.selectedBrowser.startScroll(e);

    // failed attempt 1
    //
    //aWindow.messageManager.sendAsyncMessage("Autoscroll:Start", {scrolldir:"NSEW", screenX:e.screenX, screenY:e.screenY});

    // failed attempt 2
    //
    //aWindow.gBrowser.selectedBrowser.messageManager.sendAsyncMessage("Autoscroll:Start", {scrolldir:"NSEW", screenX:e.screenX, screenY:e.screenY});

};

/* -------------------------------------------------------*
** Bootstrapped
** -------------------------------------------------------*/

function install(data, reason) {
}


function uninstall(data, reason) {
}


function startup(data, reason) {

    let windows = Services.wm.getEnumerator("navigator:browser");
    while (windows.hasMoreElements()) {
        let domWindow = windows.getNext().QueryInterface(Ci.nsIDOMWindow);
        loadIntoWindow(domWindow);
    }

    // Load into any new windows
    Services.wm.addListener(windowListener);
}


function shutdown(data, reason) {
    Services.wm.removeListener(windowListener);

    let windows = Services.wm.getEnumerator("navigator:browser");
    while (windows.hasMoreElements()) {
        let domWindow = windows.getNext().QueryInterface(Ci.nsIDOMWindow);
        unloadFromWindow(domWindow);
    }
}

var loadIntoWindow = function(aWindow) {
    if (!aWindow)
        return;

    aWindow.addEventListener("click", clicker, true);
}

var unloadFromWindow = function(aWindow) {
    if (!aWindow)
        return;

    aWindow.removeEventListener("click", clicker, true);
}


var windowListener = {
    onOpenWindow: function(aWindow) {
        // Wait for the window to finish loading
        let domWindow = aWindow.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindow);
        domWindow.addEventListener("load", function() {
            domWindow.removeEventListener("load", arguments.callee, false);
            loadIntoWindow(domWindow);
        }, false);
    },

    onCloseWindow: function(aWindow) {},
    onWindowTitleChange: function(aWindow, aTitle) {}
};