I was on the PrototypeJS website, using their rubbish search tool (which doesn't work well) and saw their was an Firefox addon, but it also required you to install another addon, as the Prototype one was just an addon package.

It lets you view the functions of HTML/CSS/JAVASCRIPT and DOM, for easy access incase you forgot what a certain function name was called, or what it did, in a sidebar inside Firefox.Double clicking it takes you to the website with more information regarding the function. You can add add-ons, I've added the PHP and Prototype one, but theirs one for Ruby on Rails, as well.

http://www.martincohen.info/products/devboi/ - Check it out.

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Not quite a n00b...