Continuing with our effort to eradicate vulnerable versions of the Java plugin, we are now blocking it for all versions of Mac OS X. We had previously blocked it for old Mac OS X versions because they would not be updated anyway, and we were holding off on updating modern versions because of a bug in the Add-ons Manager that is now fixed in Firefox 12.

1. Firefox Java Plugin Missing

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All users of Mac OS X 10.6 and above should have already been prompted to install this update. In order to avoid the block, please update immediately using Software Update. If for some reason you need to continue using an old version of the plugin, you can re-enable it in the Add-ons Manager.

Kronos is a system that requires Java. Occasionally you may run into error messages regarding the Java in your system. This guide will show you the next steps you should take if you receive an error message stating the 'Java plug-in is not installed'

Note: the Java plug-in is entirely disabled within Google Chrome, so if you are trying to use Chrome and getting an error, the first step would be to switch to Firefox, Internet Explorer, or Safari.

1. Open the Firefox browser or restart it, if it is already running
2. From the Firefox menu, select Tools, then click the Add-ons option
3. In the Add-ons Manager window, select Plugins
4. Click Java (TM) Platform plugin (Windows) or Java Applet Plug-in (Mac OS X) to select it
5. Check that the option selected is Ask to Activate or Always Activate or on older Firefox versions, click on the Enable button (if the button says Disable, Java is already enabled)

1. When Firefox is open, click on the Firefox tab in to top left of your screen.
2. Click Preferences.
3. Click Content.
4. In the Content options, ensure that Enable Java and Enable JavaScript are checked.

1. Click on the Safari tab in the upper left of your screen, and select Preferences.
2. Choose the Security option.
3. Select Allow Plug-ins, then click on Manage Website Settings.
4. Click on the Java item, select an option (Ask, Allow or Allow Always) from the pulldown list When visiting other websites.
5. Click Done, then close the Safari Preferences window.

Firefox Java Plugin Missing

1. Click Tools(Gear symbol in the upper right hand corner of the browser) and then click Internet Options.
2. Select the Security tab, and select the Custom Level button.
3. Scroll down to Scripting of Java applets.
4. Make sure the Enable radio button is checked.
5. Click OK to save your preference.