rem: this.mLauncher.Cancel(); 
add: const NS_BINDING_ABORTED = 0x804b0002; this.mLauncher.cancel(NS_BINDING_ABORTED); 
context:     onCancel: function() {        // Remove our web progress listener.        this.mLauncher.setWebProgressListener( null );        // Cancel app launcher.        try {            this.mLauncher.Cancel();        } catch( exception ) {        }        // Unhook dialog from this object.        this.mDialog.dialog = null;        // Close up dialog by returning true.        return true;    },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/44c27eb6f1e7bd771da0a9318d6a44ba7dd61a7c/nsHelperAppDlg.js/buggy/embedding/components/ui/helperAppDlg/nsHelperAppDlg.js