This Chrome extension widens github content to display as 1200px (~1000px for the new github). This is useful if one has to view project with code lines that are long.

(From: https://developer.chrome.com/extensions/getstarted.html)

1. Visit chrome://extensions in your browser (Chrome of course!)

2. Ensure that the Developer Mode checkbox in the top right-hand corner is checked.

3. Click Load unpacked extension… to pop up a file-selection dialog.

4. Navigate to the directory in which you downloaded/cloned this extension, and select it.