diff --git a/edit/edit.js b/edit/edit.js
index ded0713f..c289810a 100644
--- a/edit/edit.js
+++ b/edit/edit.js
@@ -1910,16 +1910,22 @@ chrome.runtime.onMessage.addListener(onRuntimeMessage);
 
 function replaceStyle(request) {
   const codeIsUpdated = request.codeIsUpdated !== false;
-  if (!isClean() && (!codeIsUpdated || !confirm(t('styleUpdateDiscardChanges')))) {
+  if (codeIsUpdated && editor && editor.isWarm() && !confirm(t('styleUpdateDiscardChanges'))) {
     return;
   }
+  doReplace();
 
-  if (!isUsercss(request.style)) {
-    initWithSectionStyle(request);
-    return;
+  function doReplace() {
+    if (!isUsercss(request.style)) {
+      initWithSectionStyle(request);
+      return;
+    }
+    if (codeIsUpdated) {
+      editor.replaceStyle(request.style);
+    } else {
+      editor.replaceMetas(request.style);
+    }
   }
-
-  editor.replaceStyle(request.style, codeIsUpdated);
 }
 
 function onRuntimeMessage(request) {
diff --git a/edit/source-editor.js b/edit/source-editor.js
index b14dc448..6b93c0d4 100644
--- a/edit/source-editor.js
+++ b/edit/source-editor.js
@@ -7,6 +7,9 @@
 'use strict';
 
 function createSourceEditor(style) {
+  // a flag for isWorking()
+  let hadBeenSaved = false;
+
   // draw HTML
   $('#sections').innerHTML = '';
   $('#name').disabled = true;
@@ -614,6 +617,7 @@ ${section}
       cm.setCursor(cursor);
     }
     dirty.clear();
+    hadBeenSaved = false;
   }
 
   function toggleStyle() {
@@ -637,17 +641,33 @@ ${section}
         sourceCode: style.sourceCode
       }))
       .then(replaceStyle)
+      .then(() => {
+        hadBeenSaved = true;
+      })
       .catch(err => {
         console.error(err);
         alert(err);
       });
   }
 
+  function isWarm() {
+    // indicate that the editor had been touched by the user
+    return dirty.isDirty() || hadBeenSaved;
+  }
+
+  function replaceMetas(newStyle) {
+    style.enabled = newStyle.enabled;
+    dirty.clear('enabled');
+    updateMetas();
+  }
+
   return {
     replaceStyle,
+    replaceMetas,
     save,
     toggleStyle,
     isDirty: dirty.isDirty,
-    getStyle: () => style
+    getStyle: () => style,
+    isWarm
   };
 }