Happy Little Extension is a fun little prank extension for Chrome that adds a twist to web browsing. Developed by RoundhouseMouse, this free extension allows you to play a YouTube video of your choice in the background every time someone loads a webpage.

With Happy Little Extension, you can prank your friends by installing the extension on their computer and inputting a YouTube video ID into the extension's popup. Once set up, the extension will create instances of the video in the background of the viewer's browser, creating an unexpected and amusing experience.

The process is simple and only requires two steps. First, install the Happy Little Extension onto someone's computer. Then, input the YouTube video ID into the extension's popup. If you want to temporarily turn off the background video feature, you can easily clear the ID from the popup's input field.

Give Happy Little Extension a try and have fun surprising your friends with unexpected background YouTube videos!