Enabling Java in Firefox

First, Click the Menu button screenshot of Menu button and choose Add-Ons.

sreenshot of the Firefox Menu open with the Add-ons option highlighted

Next, on Plugins from the list of items on the left. You should see Java listed on the right.

screenshot of the Plugins tab on the left with Java on the right

If it is not listed, you will need to install Java. You can install Java by clicking on this link https://java.com/en/download/index.jsp

Unblocking Java in Firefox

If you have trouble opening a video, you may see this:

screenshot of window wanting to allow Java

If you click on it, it will give you the following window. Go ahead and Allow the plugin.

screenshot with the option to Allow and Remember highlighted