mozilla/pdf.js — pull request #4856 by Snuffleupagus (2014-05-28 11:46:55+00:00)
Title: [OverlayManager] Add preventDefault to the keydown event handler

If we don't do this, pressing Esc while an overlay is open could abort loading of files for which the server doesn't specify the `contentLength`.

/cc @timvandermeij