Github Collapse Diff is a Chrome add-on developed by Charles Bergeron. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This free program is designed to hide unimportant diffs when reviewing pull requests or viewing commits on Github.

With Github Collapse Diff, users have the ability to hide specific files when reviewing the "Files Changed" section in a Github pull request. This feature allows for a more streamlined and focused review process, as users can choose to only view the files that are relevant to their review. By eliminating the clutter of unimportant diffs, users can save time and effort when reviewing code changes on Github.

Overall, Github Collapse Diff is a useful Chrome add-on for developers who frequently review pull requests on Github. Its ability to hide specific files during the review process enhances productivity and makes code reviews more efficient.