I have a few weeks old mac in which java has (deliberately) never been installed. I've been using firefox exclusively as my browser. I just checked my Add-ons, and saw that a java applet plug-in 14.3.0 was listed, and was flagged as vulnerable when I ran an add-on version check. I immediately disabled it. Since java has never been installed on my desktop, I understand that a java applet placeholder may be listed in the plug-ins list, but the listed item I see does not specify that it is a placeholder, and was specifically flagged as vulnerable by Mozilla's add-on check. My question: was my computer vulnerable while the applet was enabled even if java is not installed in my desktop?