Merge pull request #1673 from brendandahl/fallback

Add fallback option for the extension.

diff --cc extensions/firefox/components/PdfStreamConverter.js
index deeb112f633757f566196649021e620fdfc60dbd,f723c69e4ca24776f04eb5790333ad6fc7a4e83d..49fd134aed7cdc3246b3456753c56dec8d3d0ad4
--- 1/extensions/firefox/components/PdfStreamConverter.js
--- 2/extensions/firefox/components/PdfStreamConverter.js
+++ b/extensions/firefox/components/PdfStreamConverter.js
@@@ -16,7 -16,10 +16,8 @@@ const MAX_DATABASE_LENGTH = 4096
  
  Cu.import('resource://gre/modules/XPCOMUtils.jsm');
  Cu.import('resource://gre/modules/Services.jsm');
+ Cu.import('resource://gre/modules/NetUtil.jsm');
  
 -let application = Cc['@mozilla.org/fuel/application;1']
 -                    .getService(Ci.fuelIApplication);
  let privateBrowsing = Cc['@mozilla.org/privatebrowsing;1']
                          .getService(Ci.nsIPrivateBrowsingService);
  let inPrivateBrowswing = privateBrowsing.privateBrowsingEnabled;