Index: background.html
===================================================================
--- a/background.html
+++ b/background.html
@@ -4,6 +4,7 @@
     <script type="text/javascript" src="lib/polyfills/fetch.js"></script>
     <script type="text/javascript" src="ext/common.js"></script>
     <script type="text/javascript" src="ext/background.js"></script>
+    <script type="text/javascript" src="lib/lz-string.js"></script>        
     <script type="text/javascript" src="lib/compat.js"></script>
     <script type="text/javascript" src="lib/info.js"></script>
     <script type="text/javascript" src="lib/publicSuffixList.js"></script>