diff --git a/browser.js b/browser.js
index aab31ca..c663ed8 100644
--- a/browser.js
+++ b/browser.js
@@ -18,7 +18,7 @@ exports.useColors = useColors;
 
 var storage;
 
-if (chrome.storage.local !== undefined)
+if (chrome && chrome.storage)
   storage = chrome.storage.local;
 else
   storage = window.localStorage;