JavaScript is enabled in Firefox by default. If it were not enabled, numerous sites would display a warning, and many would just be blank.

If the site requires the Java plugin, you can install it from Oracle's website. See: https://www.java.com/en/download/manual.jsp (make sure to uncheck unwanted extras that may be offered during the install process)

kathydugan said

I need to enable java script .... How do you enable java ..?

Note Java and JavaScript are two different things as JavaScript was originally going to be called LiveScript. http://kb.mozillazine.org/JavaScript_is_not_Java

Oracle is depreciating their vulnerable Java Plugin in future btw. https://blogs.oracle.com/java-platform-group/entry/moving_to_a_plugin_free