YT Views is a simple Google Chrome extension that keeps a track of the watch frequencies of different YouTube videos!
Note:
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This extension was made by a non-JavaScript developer in a single day of hacking, and so, is prone to bugs and "bad practices"!
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I do not have enough money to put it up in the Chrome Web Store. So, to use it, one would need to follow instructions specified here: https://stackoverflow.com/a/24577660/7969717