If you see a pink box above, then Java is installed and enabled for this browser. The version number and provider are listed inside the box.
If there is no pink box, or you see text stating that no Java version is available, then Java is either not installed or not enabled for this browser. This is also the case if you see an icon with text reading "Click here to get the plugin".
If there is a grey box, then Java is not working correctly with this browser.
Version tester code from Java Tester.