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I cant use any Java applets. I installed icedtea-7-plugin, and it is even activated under Add-Ons, but if I for example click:

The test-screen remains grey.

I definitely have a JRE installed--openjdk-7-jre and icedtea-7-plugin are both installed.

The output of java -version is:

java version "1.6.0_24"
OpenJDK Runtime Enviroment (IcedTea6 1.11.1) (6b24-1.11.1-4ubuntu3)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)
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up vote 4 down vote accepted

I found the solution. In my privacy configuration I didn't allow Firefox to accept 3rd party cookies.

I dont have the slightest idea, why that is needed on the official Java site, but now it works!

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I'm having this same exact issue but my FireFox is set up to accept all cookies. – anon58192932 Aug 19 '14 at 21:35

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