Blocking Pop-up Windows
See Controlling Pop-ups for information on blocking pop-up windows.
Turning Off Java Applets
Some web pages provide a rich interactive experience with Java™ applets. However, some users that rely on keyboard navigation may experience problems with some Java applets that automatically set focus and do not provide a way to break out of the applet and navigate to the rest of the web page. If this is a problem for you, you can disable Java by going to Tools > Add-ons, selecting the Plugins panel, selecting the Java item(s) in the list, and then clicking Disable.
Restricting JavaScript Behavior
You can turn off JavaScript entirely by going to Tools > OptionsEdit > PreferencesFirefox > Preferences, selecting the Content panel, and unchecking Enable JavaScript. Some web pages rely on JavaScript and may not work properly if JavaScript is disabled.
If you do not wish to disable JavaScript entirely, there are also a number of advanced JavaScript settings to restrict the behavior of scripts. Immediately after the Enable JavaScript checkbox, click the Advanced button to open the Advanced JavaScript Settings window. You can control whether scripts are allowed to move or resize existing windows, raise or lower windows, disable or replace context menus, hide the status bar, or change status bar text.
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