diff --git a/lib/jquery.offline.js b/lib/jquery.offline.js
index 8153671..541552a 100644
--- a/lib/jquery.offline.js
+++ b/lib/jquery.offline.js
@@ -36,7 +36,16 @@
   // Allow the user to explicitly turn off localStorage
   // before loading this plugin
   if (typeof $.support.localStorage === "undefined") {
-    $.support.localStorage = !!window.localStorage;
+    var localStorageTest = function() {
+      try {
+        localStorage.setItem("test", "test");
+        localStorage.removeItem("test");
+        return true;
+      } catch(e) {
+        return false;
+      }
+    };
+    $.support.localStorage = !!window.localStorage && localStorageTest();
   }
 
   // modified getJSON which uses ifModified: true
@@ -162,6 +171,7 @@
                     "NS_ERROR_DOM_QUOTA_REACHED") {
                   cleanupLocalStorage();
                 }
+                break;
             }
           }