Java 1.6.0.33_22-b04 does not work properly in Firefox 3.6.12, doesn't always run applet/script but works ok in IE. It was working fine before Java updated. When will the be a Firefox fix?
I am running Firefox 3.6.12 on Windows XP Professional SP3. When Java did it's automatic update thing three problems popped up: 1) applets or scripts don't always work (I select it and nothing happens); 2) Pages with Java runs very slow; 3) Firefox does not exit (you know of this problem and sometimes still will not exit when I go to another site first).
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Your above posted system details show multiple Java Console extensions. You can uninstall (remove) the Java Console extensions and disable the Java Quick Starter extension, you do not need them to run Java applets.
See http://kb.mozillazine.org/Java#Multiple_Java_Console_extensions
See also http://www.java.com/en/download/help/quickstarter.xml - What is Java Quick Starter (JQS)? What is the benefit of running JQS? - 6.0
Disable the Java Quick Starter extension: Tools -> Addons -> Extensions Control Panel -> Java -> Advanced tab -> Miscellaneous -> Java Quick Starter (disable)
You can try a direct connection:
Control Panel > Java > General tab > "Network Settings...": "Direct Connection" (enable)