First, let's look at the Java option. What is Java, and how does it affect you on the Web? Java is just a programming language that enables certain functions on websites. By default in Firefox, this option is checked off, but Firefox does NOT come with Java already installed. If you come to a site that requires Java, Firefox will prompt you to install it.
You don't have to install Java. It's not vital to your Web experience, but it's a nice feature. I have it on my machines and I've never had any problems. If you would like to install Java direct from the source, here is the direct Java source.
Okay, on to the next and last feature that we're going to look at in Firefox's security options - Enable JavaScript. JavaScript is just another programming tool, and it is used to display images or text in a certain way. By default, the Enable JavaScript box is ticked and I recommend that you keep it that way, as there are many sites that will not display properly without it.
However, I suggest that you click on the Advanced button. This is where you can really streamline your browsing experience by choosing which annoying or frustrating Javascript tricks you would rather not see. I have every single one of these un-ticked.
