This extension sends you a reminder notification after you've been inactive for a certain amount of time. You can set this time by clicking the Idle Reminder icon in your chrome toolbar. This extension is intended for people who wan't to stay on task while working. It can also be helpful for remote workers that will appear as 'inactive' or 'idle' to their employer and coworkers after a certain amount of time away from the computer. This extension does not collect any user data, is incredibly lightweight, and completely open source. All source files available on github here: https://github.com/perlick/inactivity-reminder.