This is the first release of hotkeys which includes shortcuts for YouTube and Google Chrome.
To download this:
⁍ Download the code in zip format
⁍ Extract it
⁍ Open extension page in Google chrome
There are several ways todo that.
1.Type chrome://extensions in the url bar and press enter.
2.Click on the tree dots in the top right of the browser, then click "More tools" then click "Extensions".