diff --git a/dom/base/nsGlobalWindowInner.cpp b/dom/base/nsGlobalWindowInner.cpp
index f40fceaaa299..75887a7c1724 100644
--- a/dom/base/nsGlobalWindowInner.cpp
+++ b/dom/base/nsGlobalWindowInner.cpp
@@ -2982,12 +2982,6 @@ bool nsGlobalWindowInner::IsPrivilegedChromeWindow(JSContext* aCx,
              nsContentUtils::GetSystemPrincipal();
 }
 
-/* static */
-bool nsGlobalWindowInner::OfflineCacheAllowedForContext(JSContext* aCx,
-                                                        JSObject* aObj) {
-  return IsSecureContextOrObjectIsFromSecureContext(aCx, aObj);
-}
-
 /* static */
 bool nsGlobalWindowInner::IsRequestIdleCallbackEnabled(JSContext* aCx,
                                                        JSObject* aObj) {
diff --git a/dom/base/nsGlobalWindowInner.h b/dom/base/nsGlobalWindowInner.h
index 852cc02d8cd3..2d1b687d0ace 100644
--- a/dom/base/nsGlobalWindowInner.h
+++ b/dom/base/nsGlobalWindowInner.h
@@ -387,9 +387,6 @@ class nsGlobalWindowInner final : public mozilla::dom::EventTarget,
 
   static bool IsPrivilegedChromeWindow(JSContext* /* unused */, JSObject* aObj);
 
-  static bool OfflineCacheAllowedForContext(JSContext* /* unused */,
-                                            JSObject* aObj);
-
   static bool IsRequestIdleCallbackEnabled(JSContext* aCx,
                                            JSObject* /* unused */);
 
diff --git a/dom/webidl/OfflineResourceList.webidl b/dom/webidl/OfflineResourceList.webidl
index 75df4e2f296d..35a017d78f12 100644
--- a/dom/webidl/OfflineResourceList.webidl
+++ b/dom/webidl/OfflineResourceList.webidl
@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-[Pref="browser.cache.offline.enable", Func="nsGlobalWindowInner::OfflineCacheAllowedForContext",
+[SecureContext, Pref="browser.cache.offline.enable",
 Exposed=Window]
 interface OfflineResourceList : EventTarget {
   /**
diff --git a/dom/webidl/Window.webidl b/dom/webidl/Window.webidl
index cfe78606fea9..92e22bc1fc58 100644
--- a/dom/webidl/Window.webidl
+++ b/dom/webidl/Window.webidl
@@ -72,7 +72,7 @@ typedef OfflineResourceList ApplicationCache;
 #ifdef HAVE_SIDEBAR
   [Replaceable, Throws] readonly attribute External external;
 #endif
-  [Throws, Pref="browser.cache.offline.enable", Func="nsGlobalWindowInner::OfflineCacheAllowedForContext"] readonly attribute ApplicationCache applicationCache;
+  [Throws, SecureContext, Pref="browser.cache.offline.enable"] readonly attribute ApplicationCache applicationCache;
 
   // user prompts
   [Throws, NeedsSubjectPrincipal] void alert();