I had Java 6 update 31. i had Chrome, and it worked fine. Afterwards, there was a update to Java 7 update 9. Due to an error i couldn't install Java 7, therefore i stuck with the Java 6 update 31. However, it didn't work. I enabled the extension, and restarted the browser, yet it still didn't work. I tried uninstalling Java 6 and installing Java 7, but it still doesn't work. I can't even get Java 6 now. I don't even have anymore Java's on my computer. But i need them. Any help? I'll really appreciate it.
The problem is that Java is not detected by Firefox. So the solution was to copy the Java "np<*>.dll" plugin files from the Java application directory "bin" folder (e.g., from C:\Program Files\Java\j2re<version>\bin\) to my Mozilla browser's installation directory plugins folder (e.g., to C:\Program Files\Mozilla Firefox\plugins). In fact the plugins folder do not exist. So I just created it and pasted 3 Java plugins files I've found, restarted Firefox and... It worked!