You may not be able to access the application because your security settings are set to High. To access the application, you can either change the security level to Medium, or add the application's URL to your Trusted Websites list.
NOTE: Mozilla Firefox® does not specifically offer a trusted Websites setting. However, you can set allowed Websites for the limited purpose of installing cookies and add-ons. From the Tools menu, select Options, and then select the Security tab.