Catch error when the creation of localStorage polyfill fails in the generic viewer

web/compatibility.js

@@ -547,6 +547,10 @@ if (typeof PDFJS === 'undefined') {
       return;
     }
   } catch (e) { }
+  // When the generic viewer is used in Firefox the following code will fail
+  // when the preference 'network.cookie.lifetimePolicy' is set to 1,
+  // see Mozilla bug 365772.
+  try {
     window.localStorage = {
       data: Object.create(null),
       getItem: function (key) {
@@ -556,4 +560,7 @@ if (typeof PDFJS === 'undefined') {
         this.data[key] = value;
       }
     };
+  } catch (e) {
+    console.log('Unable to create polyfill for localStorage');
+  }
 })();