Cannot run Java with Firefox

I have tried anything for 5 hours and nothing works.
New dell laptop with Windows 8.1 64 bits.
Firefox version: 37.0a1 (2014-12-05).
Install Java twice via jxpiinstall.exe and jre-8u25-windows-i586-iftw.exe. 32 bits version.
Java test page https://www.java.com/en/download/installed.jsp reports that 'java is disabled or not installed'.
Java console shows that Java is enabled for browsers.
DOS Command line 'java -version' shows java running.
I have even put the 'C:\Program Files (x86)\Java\jre1.8.0_25' in the global PATH variable and created a JAVA_HOME variable with this directory.
I went into regedit and change the rights on all mozilla mozilla.org keys.
Finally, I downloaded Chrome and it works after some configuration.
Regards.
PS: the register process to be able to ask a question is the most impossible (being polite) that I have ever seen.

Finally, I could find a page to download a previous version.
I downloaded Firefox Setup 33.1.1.exe and installed it. It immediately donwloaded the right plugins.
I configured the Java(TM) Platform SE 8 U25 plugin to be always activated and I went to the Java test page https://www.java.com/en/download/installed.jsp and now it works.
I will try with updated version, but it is clear that this Nightly version has a problem with Windows 8.1

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By the way, I answered just because nobody did and I have some experience with using java from mozilla javascript.
But I never played with Firefox extensions.
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Adding public did it (although I thought that I'd tried that, oops) so thanks again for that. I may have a couple of other questions just in case you happen to know the answer!
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public static void sayHello(String[] args)
{code}After googling .forName and .getMethod to see how to pass parameters I've added some code:
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{code}What I thought I was doing was creating a java array: argHolder and putting the string class/object thingy?! in it so that getMethod would look for a method called "sayHello" which took a string array as an argument... but apparently not!
This brings me back to square one with a cannot find method with these arguments error:
"Error: uncaught exception: Error calling method on NPObject! [plugin exception: java.lang.IllegalArgumentException: No method found matching name getMethod and arguments [java.lang.String, [Ljava.lang.String;]]."
You don't happen to know how to do this as well do you?!
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