mozilla/pdf.js — pull request #2011 by yurydelendik (2012-08-22 15:51:22+00:00)
Title: Adds support of the indeterminate loading progress

The http://www.effi.org/system/files?file=effi-siv-251110.pdf is located on the server that does not report the total length of the file. Animating the loading indicator anyway.