From June 18th, 2016 to February 13th, 2017, 20% user give 5-star rating, 20% user give 4-star rating, 60% user give 3-star rating. for GitHub code review chrome extension.
simple and very helpful!
Can't click on a file, breaks Pull Request layout
Interesting but it doesn't work in corporate Github :(
Pretty neat - It has a few issues where it displays where it shouldn't. Example is if you go to a page that has a patch and then navigate away - it should disappear. For a similiar-but-different extension see Octotree
Very handy vim-like shortcuts for browsing github pull requests.