diff --git a/fonts.js b/fonts.js
old mode 100755
new mode 100644
index e8d629084..4f107ef80
--- a/fonts.js
+++ b/fonts.js
@@ -1293,6 +1293,10 @@ var Font = (function Font() {
                  window.btoa(data) + ');');
       var rule = "@font-face { font-family:'" + fontName + "';src:" + url + '}';
       var styleSheet = document.styleSheets[0];
+      if (!styleSheet) {
+        document.documentElement.firstChild.appendChild( document.createElement('style') );
+        styleSheet = document.styleSheets[0];
+      }
       styleSheet.insertRule(rule, styleSheet.cssRules.length);
 
       return rule;
diff --git a/pdf.js b/pdf.js
index a8ae55234..0c10e5865 100644
--- a/pdf.js
+++ b/pdf.js
@@ -3379,7 +3379,7 @@ var Page = (function() {
           } catch (e) {
             exc = e.toString();
           }
-          continuation(exc);
+          if (continuation) continuation(exc);
         });
       };
 
diff --git a/web/compatibility.js b/web/compatibility.js
old mode 100755
new mode 100644
diff --git a/web/viewer.css b/web/viewer.css
old mode 100755
new mode 100644