You can use this extension for Google Chrome to look up pages on Mozilla Developer Network (MDN). It is a useful tool to quickly get to the right page on MDN. There are two modes: search and Omnibox.

This extension doesn't require any configuration. To use it you need to install the extension first. Once you install it, you need to enter a website you want to navigate through, then click the link or type the address.

For example, when I click on the link "window.location" on MDN, I am taken to the top page of MDN, so I'm looking at the source code of that website.