The features of this plugin have been added to Github natively (https://github.com/blog/1705-expanding-context-in-diffs). This project is no longer updated, although it should continue to work for legacy versions of Github enterprise.
A user/Greasemonkey script for Chrome and Firefox that allows you to expand the missing lines in a Github diff.
- Clone the repo
- Navigate to
chrome://extensions
- Check "Developer Mode"
- Click "Load unpacked extension..." and select the repo root
- Ensure "Enabled" is checked