NextJS Utilities Extension is a free Google Extension designed for the Chrome platform. Developed by Peter Kellner, this extension falls under the category of Browsers and is classified as an Add-ons & Tools application.

The main purpose of this extension is to provide an easy way to view the size of the windows.__NEXT_DATA__ static data that is downloaded with every server-side load from the NextJS framework. NextJS is an open-source framework developed by zeit.co, which serves as a server-side rendering replacement for create-react-app.

With NextJS Utilities Extension, users can simply right-click on the toolbar icon and access a formatted JSON display of the NextJS static data size. This feature allows developers to efficiently analyze and manage the size of the static data, optimizing their NextJS applications for better performance.