mozilla/pdf.js — pull request #3399 by Snuffleupagus (2013-06-26 20:59:10+00:00)
Title: Enable changing page using Shift+Spacebar in presentation mode

This PR enables the user to go to the previous page using `Shift+Spacebar` whilst in presentation mode.

This fixes [bug 886902](https://bugzilla.mozilla.org/show_bug.cgi?id=886902).