GitHub has introduced a new feature for its Mac and Windows applications that simplifies the process of reviewing pull requests by adding a button that allows users with merge permissions to seamlessly clone the repository and switch to the branch containing the changes. If the pull request originates from a fork, the feature will automatically create a local branch, such as pr/123, enabling users to test the changes locally, even though they cannot push changes back to the fork. This enhancement aims to streamline the workflow for pull request reviewers, making the testing and reviewing process more efficient.