npm lookup is a Chrome extension developed by Michael Wuergler that allows users to quickly and easily look up npm packages from selected text on a webpage. This handy tool is especially useful when browsing through JavaScript source code on platforms like GitHub.

To use npm lookup, simply select the text you want to look up, right-click, and choose the "Lookup on npmjs.com" option from the context menu. In an instant, you'll have access to the npm package information, saving you valuable time.

One of the great features of npm lookup is its compatibility with GitHub's JavaScript source code viewer. You can easily select text within `require()` or `import` statements and quickly review the npm profiles of JavaScript modules.

With npm lookup, you no longer have to manually search for npm packages. It streamlines the process and provides you with the information you need in a matter of seconds.