GitHub code review is a free Chrome extension developed by imirgaleev. It falls under the category of Browsers and is specifically classified as an Add-ons & Tools subcategory.

This extension enhances the GitHub pull request experience by adding hot keys and a hierarchical file view. When viewing file diffs in a GitHub pull request, users can conveniently navigate between the different changes using the j/k keys. Additionally, they can easily jump between comments using the n/p keys.

One standout feature of this extension is the ability to view a hierarchical representation of the changed files by pressing the z key. This hierarchical view allows users to get a better understanding of the file structure and organization within the pull request. Each file in the hierarchy also displays a count of comments, providing valuable insights into the level of discussion and feedback received.

Overall, GitHub code review is a useful extension for developers and reviewers who frequently work with GitHub pull requests. Its hot keys and hierarchical file view feature greatly enhance the navigation and review process, making it easier to analyze and provide feedback on code changes.