As technology becomes more and more a part of our lives, digital eye strain has become an increasing problem in children, teens and adults. Using a digital device for a prolonged period of time can strain your eyes and in turn, lead to permanent vision damage. It can also cause some short term side-effects, such as blurred vision and headaches.
According to The Vision Council, over 87% of Americans admit to using digital devices for more than two hours at a time. This means that the concern about eye strain is a wide-spread concern spanning across all ages.
Luckily, there is a short exercise that, when performed routinely, can help to prevent damage to the eyes from digital screens. It's called the 20-20-20 rule, in which you focus on an object at least 20 feet away for 20 seconds every 20 minutes of screen time.
The Digital Eye Strain Prevention Tool will remind you to perform this exercise every 20 minutes and will walk you through the process. Don't have the time to do it? No worries, you can postpone the exercise for 20 minutes.
This repository contains all of the required source code files to make changes to this extension. The "master" branch contains the source code for the latest stable release. If you want to test that version, you can view the release section to download the XPI file or visit the add-on listing on Mozilla.
If you want to make changes to this extension, you are welcome to do so. All files for the extension are located in the "firefox" folder. The source code of upcoming versions (if any) will be located in another branch.
To develop and test the extension, you need to open the "about:debugging" page in Firefox and select "Load Temporary Add-on". Then you can select any file within the "firefox" folder of this repository.
Further documentation about developing Firefox extensions can be found here.
Release notes can be found on this GitHub repository or the Firefox add-ons listing.