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If I go to firefox add on I got Java Development Toolkit 7.0.110

Then I got

Java (TM platform) that is disabled due to security and I don't know how to install

Then I've heard about Java JRE.

I thought I am installing Java. Which Java anyway?

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JRE is available both as a standalone product and included in the JDK package (in fact, the JDK has both a public and private JRE, but let's not confuse matters any further! :) As mentioned below, JDK is only required if you want to code in Java. Any browser plugins in FF, IE etc. always refer to the JRE. (BTW, if you're installing the JRE then get the one which matches your OS and browser - 32 or 64-bit). – Karan Jan 23 at 3:29

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The Java Development Kit (not toolkit) or JDK is used if you want to create java applications applets etc.

The Java Runtime Environment or JRE is used if you only want to run java programs (applets) that have been created by other developers. The JRE is included with the JDK, and is also available separately

The Java download page allows you to download whichever version you want, including previous (Java 6) and next (early access) versions.

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What is Java TM Platform then? It's disabled by Firefox anyway and I want to uinstall it. – Jim Thio Jan 20 at 2:39
The platform is not a thing. It's the whole shebang. The JDK, the JRE, the virtual machine that java runs in (which is invoked when you run a java program) - these are all a part of 'the Java platform'. Just uninstall any java JRE or JDK you have and that will uninstall the platform. – mcalex Jan 20 at 2:45
For simplicities sake, think of Java as a program that runs programs. Go into your program add/remove control panel, look for Java and remove all the installed versions you might find. It will then go away for Firefox as well as IE and Windows. Congratulations, you've now made your computer safe from Oracle Java. – Fiasco Labs Jan 20 at 3:23

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