If you spend a lot of time looking at code at StackOverflow or Github, you might want to try the StackCodeExpander extension for Chrome. The code in these websites can be long in width and run off the page, requiring you to drag scrollbars. This extension adds a button at the top-left corner of such code snippets. Click it and the code is shown on a new page, so that you can read it with focus.
Tried with: StackCodeExpander 0.1.2 and Chrome 31.0.1650.63