diff --git a/content/apply.js b/content/apply.js
index c3fd540c..a399d61d 100644
--- a/content/apply.js
+++ b/content/apply.js
@@ -8,7 +8,7 @@
 const APPLY = (() => {
   const CHROME = chrome.app ? parseInt(navigator.userAgent.match(/Chrom\w+\/(?:\d+\.){2}(\d+)|$/)[1]) : NaN;
   var ID_PREFIX = 'stylus-';
-  var ROOT = document.documentElement;
+  var ROOT;
   var isOwnPage = location.protocol.endsWith('-extension:');
   var disableAll = false;
   var styleElements = new Map();
@@ -43,6 +43,7 @@ const APPLY = (() => {
     }
     return API.getSectionsByUrl(getMatchUrl())
       .then(result => {
+        ROOT = document.documentElement;
         const styles = Object.values(result);
         // CSS transition bug workaround: since we insert styles asynchronously,
         // the browsers, especially Firefox, may apply all transitions on page load
diff --git a/manifest.json b/manifest.json
index 0550b064..c7020297 100644
--- a/manifest.json
+++ b/manifest.json
@@ -29,7 +29,6 @@
       "js/storage-util.js",
       "js/sections-util.js",
       "js/worker-util.js",
-      "background/storage.js",
       "js/prefs.js",
       "js/script-loader.js",
       "js/usercss.js",