Java doesn't work on Firefox

Java works in Internet Explorer but doesn't work in FireFox.
My installed Java-related programs are:
Java 7 Update 11
Java 7 Update 11 (64-bit)
Java SE Development Kit 7 Update 11
Java SE Development Kit 7 Update 11 (64-bit)
I don't have JavaFX or anything else. I need both kits for Eclipse and other things.

Quote: ''PS Java is obviously working as I visit a site that blocks use of "right mouse click" and that is fine.''
To avoid confusion:
*http://kb.mozillazine.org/JavaScript_is_not_Java
You should see an enabled Java plugin in Tools > Add-ons > Plugins and Java should show on the about:plugins page if Java is installed properly.
*http://kb.mozillazine.org/Java#Windows_installation_issues
*http://www.java.com/en/download/help/testvm.xml
*http://www.java.com/en/download/installed.jsp

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To open the <i>about:config</i> page, type <b>about:config</b> in the location (address) bar and press the "<i>Enter</i>" key, just like you type the url of a website to open a website.<br />
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*http://kb.mozillazine.org/about:config

Java doesn't work on Firefox

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