How can I allow Java 7.55 on Firefox 29?

In collaboration with a training site that requires Java. I have the latest version of Java Runtime (55-7), Firefox blocks seem to note specifically on built 25 to 44, but maybe later built as well. My build is blocked.
I tried a section which describes the release on a trusted site, but can't find how to get the Java icon in the access address bar unlock options.
Compaq Presario running XP, 2.2 GB of memory, 500 GB disk space, connection ADSL2 + provider.
The basic problem is the delay and distortion of sounds in games designed to measure the speed of reflex, and blocked Java is the only incompatibility that I can find the published requirements.

Thank you, Alice. I've been chasing the wrong Hare. In view of the Java plugin platform, it is allowed, and so my core of sound distortion problem is not to do with plugins and maybe not Mozilla. Big step forward.

Tags: Firefox

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