Customizing the appearance of your favorite services for yourself is a pleasure not available to everyone. As a rule, finding a tool that can qualitatively change the interface is not so easy.
Improve Youtube is a free extension to improve browsing, playback, and content discovery. It contains powerful functions for customizing a beautiful user interface.
The tool contains more than 80 features for customizing the service, allows you to change almost any element. You can change the size of the player, hide related videos and comments, set shortcuts, choose a theme, etc.
The extension is free and open source. The service is available for all popular browsers: Chrome, Mozilla, Opera, Edge and others. A complete list of browsers can be found on the project page at GitHub