Github diff helper is a free Chrome extension developed by Alex V. It falls under the category of Browsers and is classified as an Add-ons & Tools subcategory.

This extension is designed to assist users who have too many files in their Github diff. It aims to filter out the noise and make code reviewing easier. By adding a small button in the Github diff view, users can select which file types they want to hide.

This extension is particularly useful for those who compile their CSS with SCSS/LESS and do not want to go through numerous generated CSS files. Similarly, if you write CoffeeScript and do not want to review the generated JS files, this extension can be of great help.

Moreover, Github diff helper is beneficial for multiple code reviewers who are responsible for reviewing only a small portion of a large diff.