YouTubeWhyd is a Chrome extension developed by metasloth that allows you to make the YouTube player default to theater mode. With this extension, you no longer have to manually switch to theater mode every time you watch a video on YouTube.

The main feature of YouTubeWhyd is its ability to force the YouTube player to always be in theater mode. Once installed, you can simply click on the extension icon to turn the feature on and off. This eliminates the need to constantly adjust the player size and provides a more immersive viewing experience.

YouTubeWhyd is free to use and is available in the Browsers category under the Add-ons & Tools subcategory. The extension is easy to install and use, making it a convenient option for those who prefer theater mode when watching YouTube videos.