YouTube Plus!

NewPipe is a lightweight YouTube front-end for Android.

YouTube Center is a userscript designed to expand the functionality of YouTube. It includes the ability to download the video you're watching, auto selecting your preferred video quality and much more.

Magic actions for YouTube is a wonderful enhancement to any video viewing experience.

Video AdBlock for Chrome blocks all the video ads on your favorite video services – YouTube and others – shown before the video. As well it's also blocking all those popup ads which driving you nuts during view.

Enhancer for YouTube is a very lightweight extension that is highly customisable, easy to use, and that will greatly improve your YouTube experience!

Allow to hide web content except multimedia elements.

Bring your image to an ambient lighting effect with just one click on the button.

The ambient light player for your favorite web browser ! Ambivid is a lightweight plugin that creates light effects around Youtube's HTML5 video player that correspond to the video content, resulting in a more immerse experience.It's easy to use and it's free, you definitely should give it a try !

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Warning: YouTube Enhancer Plus does not support the Material Design version of YouTube, and since Mozilla has planned to disable XUL add-ons like this one when Firefox 57 will be released (source) I have decided to stop its development, so I highly recommend you to use Enhancer for YouTube™ instead.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

AdBlock for YouTube removes all annoying Ads from YouTube.