diff --git a/content/apply.js b/content/apply.js
index 36dde7c7..88b605f9 100644
--- a/content/apply.js
+++ b/content/apply.js
@@ -382,12 +382,17 @@
     if (next === newElement.nextElementSibling) {
       return;
     }
-    docRootObserver.evade(() => {
+    const insert = () => {
       ROOT.insertBefore(newElement, next || null);
       if (disableAll) {
         newElement.disabled = true;
       }
-    });
+    };
+    if (docRootObserver) {
+      docRootObserver.evade(insert);
+    } else {
+      insert();
+    }
   }
 
   function replaceAll(newStyles) {
diff --git a/js/msg.js b/js/msg.js
index ca47ee52..f79e242b 100644
--- a/js/msg.js
+++ b/js/msg.js
@@ -32,7 +32,7 @@ const msg = (() => {
     sendBg,
     broadcast,
     broadcastTab,
-    broadcastExtension: send, // alias of send
+    broadcastExtension,
     on,
     onTab,
     onExtension,
@@ -122,6 +122,10 @@ const msg = (() => {
       });
   }
 
+  function broadcastExtension(...args) {
+    return send(...args).catch(console.warn);
+  }
+
   function on(fn) {
     initHandler();
     handler.both.push(fn);
diff --git a/popup/popup.js b/popup/popup.js
index 8321a072..4afedbbd 100644
--- a/popup/popup.js
+++ b/popup/popup.js
@@ -323,7 +323,7 @@ function createStyleElement({
   if (!style.usercssData && style.updateUrl && style.updateUrl.includes('?') && style.url) {
     config.href = style.url;
   } else {
-    config.href = '';
+    config.removeAttribute('href');
   }
   config.style.display =
     !style.usercssData && config.href ||