GitHub Diff Filter is a Chrome add-on developed by anth10114, available for free. This tool falls under the Browsers category, specifically in Add-ons & Tools. The main functionality of GitHub Diff Filter is to enable users to filter out specific differentials by filename on GitHub.

The add-on features a convenient button that allows users to easily toggle the filter on and off, providing a smoother experience when navigating through GitHub diffs. The developer created this tool out of personal necessity to streamline the process of going through automatically generated or modified files. However, it is important to note that the code may be sensitive to changes in GitHub's class or ID names.