Your web browser for Firefox would start with Java and all the applications would work fine. For the new versions select the Ask to Activate or Always Activate button.
If the problem persists then do as mentioned below. So, close all the open browser windows and reopen it. 2] Follow the Different Methods to Enable Java in Firefox Browser So, you would have to enable it using the below steps.
The reason could be that Java is not enabled on your system even after being installed. The problem statement is that the programs do not run even after installing Java in the system.