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Use YouTube AV1 JS - Use AV1 for video playback on YouTube
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Disable YouTube AV1 JS - Disable AV1 for video playback on YouTube
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Disable YouTube AV1 and VP9 JS - Disable AV1 and VP9 for video playback on YouTube
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Youtube UI Fix JS - Moves the controls under the video and makes the UI look like it was before august 2015
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Mark Watched YouTube Videos JS - Add an indicator for watched videos on YouTube. Use GM menus to display history statistics, backup history, and restore/merge history.
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YouTube Embedded Popupper JS - You can pop up embeded videos by right click. (It may require permission for pop up blocker at the first pop)
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YouTube JS Engine Tamer JS - To enhance YouTube performance by modifying YouTube JS Engine
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YouTube Background Playback - Kiwi Browser JS - Enable YouTube background playback in Kiwi.
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Simple Sponsor Skipper JS - Skips annoying intros, sponsors and w/e on YouTube and its frontends like Invidious and CloudTube using the SponsorBlock API.
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Hide VP9 support from YouTube JS - Hide VP9 support for Firefox. v0.2 2019-12-20
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YouTube Bolder Subtitles JS - Make subtitles bolder for better visibility on YouTube.
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YouTube Ultrawide JS - Crops the top and bottom to fit ultrawide
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YouTube Web Tweaks advanced edition JS - This script was based on YouTube Web Tweaks lite but converted into ultimate package (which includes stuff from the force rounded corners scripts)
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YouTube Clean & Fast (Hide UI/Spinner) JS - Hide all YouTube player UI (buttons, spinner, shadows, ads, branding, related videos suggestions when the video ends) immediately and show them only on mouse hover.
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YouTube → SkipCut (Open in New Tab + Instant Redirect) JS - Open YouTube watch/live/playlist links in a new SkipCut tab and instantly redirect direct loads.
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Nova YouTube(Floating video issue fixed) JS - Powerful control on YouTube
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YouTube URL Commands JS - Change video URL to a standard YouTube video, short, or YouTube Music websites.
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YT - Advanced Web Tweaks (Performance Boost and More Tweaks) JS - This userscript will disable and tweak some more of the functionally, forcing h.264 codec on all videos along with other tweaks to cut down on system resources.
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No Volume Normalization 4 YouTube JS - Enjoy YouTube videos at their true volume
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YouTube ProgressBar Preserver JS - Keep the YouTube red video progress tracker at the bottom visible even when controls auto-hide.
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YouTube: Audio Only + Toggle Shortcut JS - No Video Streaming
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▶ Open YouTube Optimizer 3.1.1 (RU/EN ver.) JS - Advanced script to improve YouTube performance and simplify interface (with search, change indicators, color theme switcher, per-option unsaved warning, preview on color change)
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YouTube to Invidious Redirector JS - Converts YouTube Links to Invidious. Made for the YouTube ad-block situation.
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Auto Like YouTube Videos v20.11.2 JS - Automatically likes YouTube videos ONLY in fullscreen mode
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Move YouTube Embed Controls - Fix Position of Volume Slider JS - Changes the position of YouTube embed buttons and the direction of the volume slider.
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OppoYoutubeLiker JS - Simple auto liker for russian and other opposition channel :)
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Hide HDR support from YouTube JS - Hide HDR support for Firefox 69. v0.1 2019-10-10
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Zoom and crop YouTube videos to fill screen height JS - Removes letterboxing by cropping the left and right edges off of full-screen YouTube videos and zooming to fill the screen height.
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Youtube UI Fix (2022) JS - Moves the controls under the video and makes the UI look like it was before august 2015 + removes round UI that was updated by youtube in October 2022
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YouTube 播放速度增强 JS - 解锁 YouTube 2.0x 倍速上限，并把脚本中设置的速度自动保存为所有视频的默认播放速度。
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YouTube Lite (melhor experiência) JS - Deixa a interface do YouTube mais leve, oculta vídeos com palavras-chaves, adiciona botão de download e abre o vídeo em uma página livre de anúncios (embed youtube-nocookie).
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Mobile Browser Background Video JS - Forces Page Visibility API to "visible" on selected domains so background video/audio keeps playing.
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YouTube Enhancer JS - Bypasses YouTube age restrictions and enables high-definition video and audio downloads with subtitle support, provided free of charge without advertisements.
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Simple Youtube Surround JS - Makes the youtube sound more surrounded ( It's better when you listen to music )