A-Tree - Github Review Helper is a free Chrome add-on developed by TimWei5566. This add-on falls under the category of Browsers and is specifically listed under the subcategory of Add-ons & Tools. A-Tree is designed to assist users in code browsing and pull request reviewing on Github.

With A-Tree, users can enjoy a tree view of both Github files and pull requests, making it easier to navigate and review code changes. The add-on also provides some handy tools for code review, such as the ability to collapse or expand files, and the option to mark all files as viewed. A-Tree also offers a quick search feature, similar to that of VSCode, which allows users to search for files using customizable hotkeys.

One of the standout features of A-Tree is its support for single-page applications (SPA) on Github Pages. Additionally, the add-on supports both private and Enterprise repositories, making it suitable for a wide range of users.

Please note that the extension requires the "contextMenus" permission in order to provide a simple way for Github Enterprise users to enable the extension via right-click.