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Connect Berkeley Snap! to Arduino boards Snap4Arduino connector allows your Snap4Arduino online at http://snap4arduino.rocks/run to connect to your serial port and then, connect your Arduino device to Snap! Running Chrome/Chromium with this plugin is the way to use Snap4Arduino without the desktop versions. So, it's the way to use it on Chromebooks.
rating_count is the Chrome Web Store ratings count, not a written-review count.