var dir = __LOCATION__.parent.parent;
var file = dir.clone();
file.append("platform");
let xr = Cc["@mozilla.org/xre/app-info;1"].getService(Ci.nsIXULRuntime);
file.append(xr.OS + "_" + xr.XPCOMABI);
file.append(ctypes.libraryName("foolib"));
var libpath=file.path;

extensionUninstaller = {
    guid: "some@guid",
    isUninstall: false,
    uninstallConfirmed: false,
    get oSvc() {
        delete this.oSvc;
        return this.oSvc = Components.classes["@mozilla.org/observer-service;1"]
            .getService(Components.interfaces.nsIObserverService);
    },
    get newAddonManager() {
        delete this.newAddonManager;
        return this.newAddonManager = !("@mozilla.org/extensions/manager;1" in Components.classes);
    },
    initUninstallObserver: function() {
        this.oSvc.addObserver(this, "quit-application-granted", false);
        if(this.newAddonManager) {
            try {
                // In Gecko 2 XPCOM can starts after "final-ui-startup"
                this.addAddonListener();
            }
            catch(e) {
                // Wait for AddonManager startup
                this.oSvc.addObserver(this, "final-ui-startup", false);
            }
        }
        else
            this.oSvc.addObserver(this, "em-action-requested", false);
    },
    destroyUninstallObserver: function() {
        this.oSvc.removeObserver(this, "quit-application-granted");
        if(this.newAddonManager)
            AddonManager.removeAddonListener(this);
        else
            this.oSvc.removeObserver(this, "em-action-requested");
    },
    observe: function(subject, topic, data) {
        if(topic == "final-ui-startup") {
            this.oSvc.removeObserver(this, "final-ui-startup");
            this.addAddonListener();
        }
        else if(topic == "quit-application-granted") {
            this.destroyUninstallObserver();
            if(this.isUninstall && this.uninstallConfirmed)
                this.uninstall();
        }
        else if(
            topic == "em-action-requested"
            && subject instanceof Components.interfaces.nsIUpdateItem
            && subject.id == this.guid
        ) {
            if(data == "item-uninstalled")
                this.handleUninstalling();
            else if(data == "item-cancel-action")
                this.isUninstall = false;
        }
    },
    addAddonListener: function() {
        // Firefox 3.7a5pre+:
        // In Firefox 1.5 we can't use "import" keyword (we get syntax error)
        Components.utils["import"]("resource://gre/modules/AddonManager.jsm");
        //AddonManagerPrivate.startup();
        AddonManager.addAddonListener(this);
    },
    onUninstalling: function(ext, requiresRestart) {
        if(ext.id == this.guid)
            this.handleUninstalling();
    },
    onOperationCancelled: function(ext) {
        if(
            ext.id == this.guid
            && !(ext.pendingOperations & AddonManager.PENDING_UNINSTALL)
        )
            this.isUninstall = false;
    },
    handleUninstalling: function() {
        this.isUninstall = true;
        this.uninstallConfirm();
    },
    uninstallConfirm: function() {
        this.uninstallConfirmed = true; // Or ask user...
    },
    uninstall: function() {
        // Do something
    }
};
extensionUninstaller.initUninstallObserver();

try {
                // In Gecko 2 XPCOM can starts after "final-ui-startup"
                this.addAddonListener();
            }
            catch(e) {
                // Wait for AddonManager startup
                this.oSvc.addObserver(this, "final-ui-startup", false);
            }