WTF MDN Previewer is a free Chrome add-on developed by jaycog44. This add-on aims to make searching MDN (Mozilla Developer Network) quick and easy. With WTF MDN Previewer, a dropdown menu appears when you search for a specific MDN documentation. This dropdown menu provides a quick preview of the MDN doc you are searching for, saving you time and effort.

The main feature of WTF MDN Previewer is its ability to provide a preview of the MDN documentation without leaving your current tab. This means you can quickly glance at the preview and decide whether it's the information you're looking for or if you need to continue searching. This feature enhances the browsing experience for developers who frequently refer to MDN for documentation and resources.

Overall, WTF MDN Previewer is a handy tool for developers who want to streamline their MDN searching process. With its quick preview feature, it saves time and effort by providing a glimpse of the relevant documentation right in your browser. Give it a try if you're looking for a convenient way to access MDN while coding.