Greasy Fork is available in English.
Prevents auto-play HTML5 videos in new tabs on any page (not just YouTube) and pauses videos when leave/switch/change the current tab, to prevent any video playing in the background. This auto play blocker is an alternative to Click-to-Play / click to play. On some times like YouTube, click twice to begin first playback — From Dan Moorehead (xeonx1), developer of PowerAccess™ (http://PowerAccessDB.com)
< Відгуки до AutoPlay Disabled for HTML5 Videos + Pause on Switch Tab
Works great
This is the only script so far that works for me on youtube and pauses all videos from playing on page load, not just up next.