purge polyfill from firefox branch; fix 'lookup doesn't work on certain strings when certain json dictionaries are loaded' bug

options.html

@@ -5,7 +5,6 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>Nazeka: options</title>
-<script src="include/browser-polyfill.min.js" charset="UTF-8"></script>
 <script type="text/javascript" src="options.js"></script>
 <style>
 body