In the Quick Java options, you can choose to hide one or more of the buttons shown in the add-ons toolbar. The extension also installs a favorites button in the Firefox toolbar, clicking on which your favorite settings are loaded. In the options, you can choose these favorite options (which items should be disable or enabled when you click on the favorites button). During the testing, I found that there is some glitch in the favorites button and it should not be used. There are some advanced settings in which you can specify a regular expression string for disabling Java, Flash or Silverlight – but it should be left untouched.
So if you want to block any of these items in Firefox and want to browse the websites without loading any of these scripts and plugins, then you can quickly do this through the Quick Java extension for Firefox. This extension makes toggling Javacript, images, Java, Flash or other items as easy as clicking on a button.
You can download and install the Quick Java add-on from https://addons.mozilla.org/.