diff --git a/web/viewer.js b/web/viewer.js
index 857429c5e..e8eb9ad3b 100644
--- a/web/viewer.js
+++ b/web/viewer.js
@@ -374,13 +374,6 @@ var PDFView = {
     }
   },
 
-  fallback: function pdfViewDownload() {
-    var url = this.url.split('#')[0];
-    if (!PDFJS.isFirefoxExtension)
-      return; // can't do this with regular viewer
-    FirefoxCom.request('fallback', url);
-  },
-
   navigateTo: function pdfViewNavigateTo(dest) {
     if (typeof dest === 'string')
       dest = this.destinations[dest];