Your plugins list in "more system details" shows Next Generation Java Plug-in 1.6.0_31 for Mozilla browsers so Java should not be blocked.

Could you post a link to a webpage where Java isn't working for you? YouTube uses Flash, not Java. Here is a list of Java test pages you can try, to confirm that Java is working, from http://kb.mozillazine.org/Java#Testing_Java

• Test your Java Virtual Machine (JVM) at java.com.
• Java Information - BrowserSpy.dk
• Java Tester - The test pages at javatester.org will tell you if your web browser is enabled for Java and, if so, the Java version.
• Java Plugin Detector

By the way, I see in your plugins list that you also have the VLC media player Web Plugin 2.0.0 so, it's possible that the VLC plugin is causing a conflict if YouTube or other videos don't work. See Fix common audio and video issues (you may need to disable the VLC Media Player plugin in the Add-ons -> Plugins list for some media to play).

My apologies, Flash is what I meant, yet was fixated on trying to fix Java (which as you pointed out was working fine). It was a combo of NoScript & Adblock that had caused something to go amiss.

Thank you for your time.

Thanks for posting back that the problem was with Flash, not Java, and that it was caused by a combination of NoScript and Adblock extensions. Disabling interfering extensions or ad-blocking software was suggested in the Fix common audio and video issues article so I'm glad if that link was helpful for you.