diff --git a/toolkit/mozapps/extensions/content/extensions.js b/toolkit/mozapps/extensions/content/extensions.js
index b2625001d546..f5201100f632 100644
--- a/toolkit/mozapps/extensions/content/extensions.js
+++ b/toolkit/mozapps/extensions/content/extensions.js
@@ -694,13 +694,9 @@ function displaySearchResults(addons, count, isRecommended) {
                      gRDF.GetLiteral("header-recommended"),
                      true);
 
-    // Case insensitive sort
+    // Locale sensitive sort
     function compare(a, b) {
-      if (a.name.toLowerCase() < b.name.toLowerCase())
-        return -1;
-      if (a.name.toLowerCase() > b.name.toLowerCase())
-        return 1;
-      return 0;
+      return String.localeCompare(a.name, b.name);
     }
     addons.sort(compare);
   }
@@ -899,13 +895,9 @@ function rebuildPluginsDS()
 
   cleanDataSource(gPluginsDS, rootctr);
 
-  // Case insensitive sort
+  // Locale sensitive sort
   function compare(a, b) {
-    if (a.name.toLowerCase() < b.name.toLowerCase())
-      return -1;
-    if (a.name.toLowerCase() > b.name.toLowerCase())
-      return 1;
-    return 0;
+    return String.localeCompare(a.name, b.name);
   }
   plugins.sort(compare);
 
diff --git a/toolkit/mozapps/extensions/src/nsExtensionManager.js.in b/toolkit/mozapps/extensions/src/nsExtensionManager.js.in
index fd2a114b23dd..e67d5bc8a486 100644
--- a/toolkit/mozapps/extensions/src/nsExtensionManager.js.in
+++ b/toolkit/mozapps/extensions/src/nsExtensionManager.js.in
@@ -7989,17 +7989,15 @@ ExtensionsDataSource.prototype = {
       if (itemType & type) {
         items.push({ item   : item,
                      ordinal: ordinal,
-                     sortkey: this.getItemProperty(id, propertyName).toLowerCase() });
+                     sortkey: this.getItemProperty(id, propertyName) });
         ordinal++;
       }
     }
 
     var direction = isAscending ? 1 : -1;
-    // Case insensitive sort
+    // Locale sensitive sort
     function compare(a, b) {
-        if (a.sortkey < b.sortkey) return (-1 * direction);
-        if (a.sortkey > b.sortkey) return (1 * direction);
-        return 0;
+      return String.localeCompare(a.sortkey, b.sortkey) * direction;
     }
     items.sort(compare);