StayFocusd is a great Google Chrome extension that allows you to stay focused online by disabling web pages that you will check as waste of time (like Facebook or Youtube), so you can focus on work or whatever you wish to do by changing your usual online habits for the better.
How to uninstall StayFocusd Chrome extension? Open Google Chrome and simply go to Preferences -> Extensions or click on any extension in upper right corner of Chrome browser and right click on it and choose Manage extensions. Either way you go you will now be on Extensions page (also accessible via chrome://extensions/).
Now search for StayFocusd and in the right upper corner of the extension you will find a bin icon. Click it and you will remove Stay Focused extension from your Chrome browser.