Greasemonkey userscript to restore the functionality of the back button on github pull requests when navigating to the commits/files tabs.

Install Greasemonkey (in firefox, I think there's Greasemonkey or similar for chrome but I haven't tested it myself) then clicking on the raw view of the javascript file should prompt you to install it in Greasemonkey. Feel free to inspect it first!

Now go to a pull request! Now click the Files tab! Now use the back button! Now rejoice!