YouTube Control Center is an open-source project that aims to enhance the overall YouTube experience by providing the end user with more control in what the playback process is concerned.
YouTube High Definition is a powerful tool that will let you automatically play all YouTube videos in HD (High Definition), turn off annotations, change video player size, auto stop videos, auto mute videos, control embedded videos and much more.
a download manager with multi-threading support
Download YouTube videos in all available formats and extract the original audio files
Adds Steam Database link across Steam Community and Store.
A new friend in every new tab.
Tons of features to improve your user experience on YouTube™.
瞬间过滤B站(bilibili.com)刷屏的相似弹幕，还你清爽的弹幕视频体验。 *a tweak for a Chinese website. Please ignore this add-on if you are not a user of bilibili.com.*
Video Downloader Plus enables you to download SD and HD videos if the extension can download them.
This is probably a laser cat add-on so you can shoot laser cat lasers at things.
This extension allows you to watch YouTube videos that are blocked for your region.
Add a content menu Open with VLC on audio / video links. Links must contains file extensions (.mp4, .mkv, ...) Prerequisite : - VLC must be opened - HTTP web interface must be enabled (Settings > Interface > HTTP web interface)