Once you are at the Control Panel:

• Go to Java (32/64-bit) and this will load up the appropriate settings.

Once you are in the Java Control Panel, you can now disable the software from running in your browser.

• Hit the Security tab.
• On the Security settings, uncheck the box saying Enable Java content in the browser.
• Hit Apply then OK.

You should now have disabled Java in Windows.

To disable Java in Mac OS X, follow these instructions.

• Go to the Apple symbol () in the menu bar.
• Select System Preferences.
• On System Preferences, type in Java and select the highlighted panel.

A new window will appear warning you that the Java settings need to be opened in a new console. This will open. Same as with Windows, simply:

• Hit the Security tab.
• On the Security settings, uncheck the box saying Enable Java content in the browser.
• Hit Apply then OK.

You should now have disabled Java in OS X.

In Safari (both Windows and Mac), you can disable Java in the browser, as well as on the operating system.

• Go to Safari Preferences (either from the Edit menu or the Safari menu on Mac).
  

Once you open up the Safari preferences, you should:

• Go to the Security tab.
• Under Web Content, ensure that the Enable Java box is unticked.

The settings are saved automatically. Close the dialog box and restart the browser.

You can check and verify to see if Java has been disabled by following the instructions here.

On Chrome, you may not have Java installed if you are running a 64-bit operating system. Still, it's better to check to be on the safe side.

• Open Chrome and in the omnibar (search/address bar), type in chrome://plugins and hit Enter.
• Scroll down until you see Java (TM) and a version number. Simply hit Disable and the settings will be saved for you.

And that's it. Restart the browser and Java should be disabled.

You can check and verify to see if Java has been disabled by following the instructions here.

Firefox users may already find that Java has been disabled. Still, it's worth checking to make sure in case you are using an older version of the browser.

• In both Windows and Mac, go to Tools and then Add-ons.

Once you have loaded the add-ons section, which includes extensions and themes, make sure you:

• Select the Extensions button (which looks like a Lego block).
• Under Java (TM) Platform followed by a version number, hit the Disable button.

Close and restart the browser. Java should now be disabled.

You can check and verify to see if Java has been disabled by following the instructions here.