Github Quarterly Contributions is a Chrome add-on developed by Eric Bidelman. It falls under the category of Browsers and is classified as an Add-ons & Tools subcategory. This add-on adds a quarterly stats button on a user's landing page.

The main feature of Github Quarterly Contributions is the "Add previous quarter" button that appears on a user's Github landing page. When pressed, this button fetches the last quarter's worth of commits, pull requests, and issues for the user. Subsequent presses of the button allow the user to go back to additional quarters.

It is important to note that if the user is logged in, this add-on will include private commits, pull requests, and issues. However, when viewing someone else's page, only their public activity will be returned.

Github Quarterly Contributions is a free add-on available for the Chrome platform. It provides users with a convenient way to view their quarterly contributions on Github, making it easier to track and analyze their activity.