Does the XUL cache still exist?

I was looking at the following article - http://blog.mozilla.org/addons/2009/01/28/how-to-develop-a-firefox-extension/ - as I would like to play around with developing an extension. The article recommends disabling XUL caching with the following option in about:config - nglayout.debug.disable_xul_cache = true
This option does not appear to be available to me. Is this is an error, or is XUL caching not used anymore, or do I need to go elsewhere to disable it?
I am on version 19.0.2, and the OS is Ubuntu 12.10

Sure, you can see that in the source code.
*http://mxr.mozilla.org/mozilla-central/source/content/xul/document/src/nsXULPrototypeCache.cpp#35

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