diff --git a/libcef/browser/alloy/alloy_content_browser_client.cc b/libcef/browser/alloy/alloy_content_browser_client.cc
index 0215a1ed9..f3aeeee84 100644
--- a/libcef/browser/alloy/alloy_content_browser_client.cc
+++ b/libcef/browser/alloy/alloy_content_browser_client.cc
@@ -1523,6 +1523,18 @@ bool AlloyContentBrowserClient::ShouldAllowPluginCreation(
   return true;
 }
 
+void AlloyContentBrowserClient::OnWebContentsCreated(
+    content::WebContents* web_contents) {
+  // Attach universal WebContentsObservers. These are quite rare, and in most
+  // cases CefBrowserPlatformDelegateAlloy::BrowserCreated and/or
+  // CefExtensionsAPIClient::AttachWebContentsHelpers should be used instead.
+
+  if (extensions::ExtensionsEnabled()) {
+    extensions::CefExtensionWebContentsObserver::CreateForWebContents(
+        web_contents);
+  }
+}
+
 bool AlloyContentBrowserClient::IsFindInPageDisabledForOrigin(
     const url::Origin& origin) {
   // For PDF viewing with the PPAPI-free PDF Viewer, find-in-page should only
diff --git a/libcef/browser/alloy/alloy_content_browser_client.h b/libcef/browser/alloy/alloy_content_browser_client.h
index 7be46fc2d..037776ed5 100644
--- a/libcef/browser/alloy/alloy_content_browser_client.h
+++ b/libcef/browser/alloy/alloy_content_browser_client.h
@@ -236,6 +236,7 @@ class AlloyContentBrowserClient : public content::ContentBrowserClient {
   bool ShouldAllowPluginCreation(
       const url::Origin& embedder_origin,
       const content::PepperPluginInfo& plugin_info) override;
+  void OnWebContentsCreated(content::WebContents* web_contents) override;
   bool IsFindInPageDisabledForOrigin(const url::Origin& origin) override;
 
   CefRefPtr<CefRequestContextImpl> request_context() const;
diff --git a/libcef/browser/alloy/browser_platform_delegate_alloy.cc b/libcef/browser/alloy/browser_platform_delegate_alloy.cc
index b254c0e07..6280f2f8c 100644
--- a/libcef/browser/alloy/browser_platform_delegate_alloy.cc
+++ b/libcef/browser/alloy/browser_platform_delegate_alloy.cc
@@ -179,9 +179,6 @@ void CefBrowserPlatformDelegateAlloy::BrowserCreated(
   printing::CefPrintViewManager::CreateForWebContents(web_contents_);
 
   if (extensions::ExtensionsEnabled()) {
-    extensions::CefExtensionWebContentsObserver::CreateForWebContents(
-        web_contents_);
-
     // Used by the tabs extension API.
     zoom::ZoomController::CreateForWebContents(web_contents_);
   }
diff --git a/libcef/browser/extensions/extensions_api_client.cc b/libcef/browser/extensions/extensions_api_client.cc
index 131b46211..e9e49a103 100644
--- a/libcef/browser/extensions/extensions_api_client.cc
+++ b/libcef/browser/extensions/extensions_api_client.cc
@@ -52,8 +52,6 @@ void CefExtensionsAPIClient::AttachWebContentsHelpers(
   PrefsTabHelper::CreateForWebContents(web_contents);
   printing::CefPrintViewManager::CreateForWebContents(web_contents);
 
-  CefExtensionWebContentsObserver::CreateForWebContents(web_contents);
-
   // Used by the PDF extension.
   pdf::PDFWebContentsHelper::CreateForWebContentsWithClient(
       web_contents, std::unique_ptr<pdf::PDFWebContentsHelperClient>(