This extension automatically disables the feature where Youtube will automatically play the next suggested video. You can just click it off manually, but you need to remember to do that every time and it wastes precious seconds you could be using to watch more Youtube. There is also an option to permanently enable autoplay (if you actually want autoplay on) by flipping the switch in the extension popup.
Feel free to contact me if you find any issues or have any suggestions.
This extension is not intended to stop videos from automatically playing when you open a new tab. It only stops the next suggested video from playing.