Eye Break by jimmyl02

This addon allows you to give yourself simple reminders in a set interval to give your eyes a break. It produces a desktop notification in a set interval to helpfully remind you to give your eyes a break. With the source code fully open source, no data ever leaves your computer and you should be fully secure.

NOTE: in order for notifications to show up on macos, it is required to enable notifications for firefox in macos settings

It is fully open-source and the code can be viewed at: https://github.com/jimmyl02/eye-break