A box labeled “Content settings” should be highlighted. Click that, and then scroll down to the Plug-ins section. Click the “Disable individual plug-ins” link, find Java in the list ...

More here on how to manage Java settings. To disable the Java plugin in the Mozilla Firefox browser, via the Firefox menu, open the Addons manager and select Plugins. Disable all the Java entries ...

Scroll to the entry for Java and click Disable. To shut down Java in Safari, click Safari > Preferences (or press Command-,), select the Security tab at the top of the window, and uncheck Enable Java.

In Firefox, select "Tools" from the main menu, then "Add-ons," then click the "Disable" button next to any Java plug-ins. • In Safari, click "Safari" in the main menu bar, then "Preferences ...

If you do need it, disable Java in your default browser, use a second browser when Java is required, and set your Java security settings to “High” so that it prompts you before loading an applet.