With Focus 45 Chrome Extension, Try to be Productive on Web.

Focus 45 is an extension for Google Chrome which prevents you from being distracted when working on web. With one click, you can achieve 45 minutes of ZEN mode. In case of necessity, you deactivate for 5 minutes by entering the provided code. It is Promodoro technique on Google Chrome. Other features include, customizable blacklisted sites, changing the length of timer.

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