Break Timer is a free Chrome add-on developed by tomjwatson. It allows users to enforce periodic breaks to prevent repetitive strain injury (RSI) and eye strain. This add-on is especially useful for individuals who spend long hours working or studying on their computers.

With Break Timer, users can customize the duration and frequency of their breaks according to their preferences. They can choose to receive reminders through simple notifications or fullscreen break windows. The add-on also allows users to set specific working hours, ensuring that reminders are only given when desired.

Break Timer offers customization options for the appearance of break windows and notifications, including the choice of colors and text. Users can also opt to have a gong sound played at the start and end of each break. Additionally, the add-on allows for skipping, postponing, and ending breaks as needed.

One notable feature of Break Timer is its ability to intelligently restart the break countdown if it detects that the user has not been actively using the computer for a certain period of time.