Chrome/ium/Firefox extension to disable YouTube's autoplay "feature".
This implementation is completely pragmatic, so no fancy code: we just get the job done.
If it isn't working, just create an issue, contribute with a pull request or contact me at luciano+chromeextensions@ratamero.com and I'll publish it as soon as I can ;]
https://chrome.google.com/webstore/detail/youtube-autoplay-disabler/mlebignjhimfeggkjhhgbhomibiplmem
https://addons.mozilla.org/en-US/firefox/addon/youtube-autoplay-disabler/