Click on Tools and select Options.
Click on the Content tab and ensure that Enable JavaScript is ticked.
Click OK.
Quit/exit Mozilla Firefox after you change settings and then re-start the application.
Click on Tools and select Internet Options.
Click on the Security tab.
Click on the Custom Level button.
Under Settings:
scroll down to Scripting and enable Active scripting and Scripting of Java applets.
scroll down to User Authentication and under Logon select Automatic logon only in Intranet zone.
Under Reset custom settings, select Medium-low from the dropdown list. Click Reset.
Click OK.
Quit/exit Internet Explorer after you change settings and then re-start the application.