Github Reviewer Groups is a free Chrome add-on developed by Khaled Ali. It falls under the category of Browsers and is specifically listed under Add-ons & Tools. This add-on allows users to create groups of Github users and add them as reviewers to a pull request in just one click.

To use this add-on, users need to enter an access key with repo access. By clicking on the "+" button, users can create a group and name it accordingly. They can then enter the usernames or logins of the users they wish to bulk-add as reviewers. Once the current active tab is on a pull request that the user has permission to edit, they can simply click on "add reviewers" to complete the process.

One of the key advantages of using Github Reviewer Groups is the time-saving aspect. Users can enjoy saving 10 extra seconds of their life every time they add reviewers, and even more if they have to remember everyone's logins. It is important to note that this add-on does not communicate with any servers other than Github's API. It is open source, and users are encouraged to check the Github repository for confirmation. As a precaution, users are advised to never share their access codes with anyone.

Overall, Github Reviewer Groups is a useful Chrome add-on that simplifies the process of adding Github users as reviewers to pull requests. Its straightforward interface and time-saving capabilities make it a valuable tool for developers working on collaborative projects.