This extension makes the YouTube interface dark. To turn it on, click the extension icon in the upper-right corner. If you need to turn off Dark Theme, click the icon again.
It's more convenient to watch videos when the interface is dark! So, not only will this extension make your favorite video hosting more elegant, but also it saves your eyes.
Check a number of wonderful features of Dark Theme for YouTube:
1) It's free
2) It is installed in one click
3) It takes just 19kb on your disk
4) Dark Theme can be turned on or off with one click