Download or clone the repository. if it's a zip file, extract it to a folder.
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Copy
chrome://extensions
to the browser address bar and press enter -
Click the Load unpacked extension button. A file dialog appears.
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In the file dialog, choose the directory where the files are. Unless you get an error dialog, you've now installed the app.
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Click the icon for the app.(Viola!, we just launched our new extension!).