diff --git a/devtools/shared/heapsnapshot/tests/gtest/DevTools.h b/devtools/shared/heapsnapshot/tests/gtest/DevTools.h
index b7ff696f4de2..01bd1dc8b26b 100644
--- a/devtools/shared/heapsnapshot/tests/gtest/DevTools.h
+++ b/devtools/shared/heapsnapshot/tests/gtest/DevTools.h
@@ -69,15 +69,9 @@ struct DevTools : public ::testing::Test {
   }
 
   static const JSClass* getGlobalClass() {
-    static const JSClassOps globalClassOps = {
-      nullptr, nullptr, nullptr, nullptr,
-      nullptr, nullptr, nullptr, nullptr,
-      nullptr, nullptr,
-      JS_GlobalObjectTraceHook
-    };
     static const JSClass globalClass = {
       "global", JSCLASS_GLOBAL_FLAGS,
-      &globalClassOps
+      &JS::DefaultGlobalClassOps
     };
     return &globalClass;
   }
@@ -85,21 +79,9 @@ struct DevTools : public ::testing::Test {
   JSObject* createGlobal()
   {
     /* Create the global object. */
-    JS::RootedObject newGlobal(cx);
     JS::RealmOptions options;
-    newGlobal = JS_NewGlobalObject(cx, getGlobalClass(), nullptr,
-                                   JS::FireOnNewGlobalHook, options);
-    if (!newGlobal)
-      return nullptr;
-
-    JSAutoRealm ar(cx, newGlobal);
-
-    /* Populate the global object with the standard globals, like Object and
-       Array. */
-    if (!JS::InitRealmStandardClasses(cx))
-      return nullptr;
-
-    return newGlobal;
+    return JS_NewGlobalObject(cx, getGlobalClass(), nullptr,
+                              JS::FireOnNewGlobalHook, options);
   }
 
   virtual void TearDown() {
diff --git a/js/src/fuzz-tests/tests.cpp b/js/src/fuzz-tests/tests.cpp
index c605904a4125..162faad3e701 100644
--- a/js/src/fuzz-tests/tests.cpp
+++ b/js/src/fuzz-tests/tests.cpp
@@ -25,15 +25,9 @@ JSContext* gCx = nullptr;
 static const JSClass*
 getGlobalClass()
 {
-    static const JSClassOps cOps = {
-        nullptr, nullptr, nullptr, nullptr,
-        nullptr, nullptr, nullptr, nullptr,
-        nullptr, nullptr,
-        JS_GlobalObjectTraceHook
-    };
     static const JSClass c = {
         "global", JSCLASS_GLOBAL_FLAGS,
-        &cOps
+        &JS::DefaultGlobalClassOps
     };
     return &c;
 }
@@ -42,27 +36,13 @@ static JSObject*
 jsfuzz_createGlobal(JSContext* cx, JSPrincipals* principals)
 {
     /* Create the global object. */
-    JS::RootedObject newGlobal(cx);
     JS::RealmOptions options;
     options.creationOptions().setStreamsEnabled(true);
 #ifdef ENABLE_BIGINT
     options.creationOptions().setBigIntEnabled(true);
 #endif
-    newGlobal = JS_NewGlobalObject(cx, getGlobalClass(), principals, JS::FireOnNewGlobalHook,
-                                   options);
-    if (!newGlobal) {
-        return nullptr;
-    }
-
-    JSAutoRealm ar(cx, newGlobal);
-
-    // Populate the global object with the standard globals like Object and
-    // Array.
-    if (!JS::InitRealmStandardClasses(cx)) {
-        return nullptr;
-    }
-
-    return newGlobal;
+    return JS_NewGlobalObject(cx, getGlobalClass(), principals, JS::FireOnNewGlobalHook,
+                              options);
 }
 
 static bool
diff --git a/js/src/gdb/gdb-tests.cpp b/js/src/gdb/gdb-tests.cpp
index 5f90b903b020..0745167fc742 100644
--- a/js/src/gdb/gdb-tests.cpp
+++ b/js/src/gdb/gdb-tests.cpp
@@ -13,17 +13,10 @@
 
 using namespace JS;
 
-static const JSClassOps global_classOps = {
-    nullptr, nullptr, nullptr, nullptr,
-    nullptr, nullptr, nullptr, nullptr,
-    nullptr, nullptr,
-    JS_GlobalObjectTraceHook
-};
-
 /* The class of the global object. */
 static const JSClass global_class = {
     "global", JSCLASS_GLOBAL_FLAGS,
-    &global_classOps
+    &DefaultGlobalClassOps
 };
 
 static volatile int dontOptimizeMeAway = 0;
@@ -90,10 +83,6 @@ main(int argc, const char** argv)
                         nullptr, JS::FireOnNewGlobalHook, options)));
     JSAutoRealm ar(cx, global);
 
-    /* Populate the global object with the standard globals,
-       like Object and Array. */
-    checkBool(JS::InitRealmStandardClasses(cx));
-
     argv++;
     while (*argv) {
         const char* name = *argv++;
diff --git a/js/src/jsapi-tests/testChromeBuffer.cpp b/js/src/jsapi-tests/testChromeBuffer.cpp
index 08c753ba95aa..2aa1fbe69fda 100644
--- a/js/src/jsapi-tests/testChromeBuffer.cpp
+++ b/js/src/jsapi-tests/testChromeBuffer.cpp
@@ -9,24 +9,10 @@
 
 static TestJSPrincipals system_principals(1);
 
-static const JSClassOps global_classOps = {
-    nullptr,
-    nullptr,
-    nullptr,
-    nullptr,
-    nullptr,
-    nullptr,
-    nullptr,
-    nullptr,
-    nullptr,
-    nullptr,
-    JS_GlobalObjectTraceHook
-};
-
 static const JSClass global_class = {
     "global",
     JSCLASS_IS_GLOBAL | JSCLASS_GLOBAL_FLAGS,
-    &global_classOps
+    &JS::DefaultGlobalClassOps
 };
 
 static JS::PersistentRootedObject trusted_glob;
diff --git a/js/src/jsapi-tests/testDebugger.cpp b/js/src/jsapi-tests/testDebugger.cpp
index 2024cc5925e4..9639d4ad3bf8 100644
--- a/js/src/jsapi-tests/testDebugger.cpp
+++ b/js/src/jsapi-tests/testDebugger.cpp
@@ -18,10 +18,6 @@ BEGIN_TEST(testDebugger_newScriptHook)
     JS::RootedObject g(cx, JS_NewGlobalObject(cx, getGlobalClass(), nullptr,
                                               JS::FireOnNewGlobalHook, options));
     CHECK(g);
-    {
-        JSAutoRealm ar(cx, g);
-        CHECK(JS::InitRealmStandardClasses(cx));
-    }
 
     JS::RootedObject gWrapper(cx, g);
     CHECK(JS_WrapObject(cx, &gWrapper));
diff --git a/js/src/jsapi-tests/testMutedErrors.cpp b/js/src/jsapi-tests/testMutedErrors.cpp
index 561287d6f9e1..681d86809051 100644
--- a/js/src/jsapi-tests/testMutedErrors.cpp
+++ b/js/src/jsapi-tests/testMutedErrors.cpp
@@ -50,8 +50,6 @@ eval(const char* asciiChars, bool mutedErrors, JS::MutableHandleValue rval)
 						   JS::FireOnNewGlobalHook, globalOptions));
     CHECK(global);
     JSAutoRealm ar(cx, global);
-    CHECK(JS::InitRealmStandardClasses(cx));
-
 
     JS::CompileOptions options(cx);
     options.setMutedErrors(mutedErrors)
diff --git a/js/src/jsapi-tests/testSetProperty.cpp b/js/src/jsapi-tests/testSetProperty.cpp
index 56a7c8a97b0b..46972e476bcf 100644
--- a/js/src/jsapi-tests/testSetProperty.cpp
+++ b/js/src/jsapi-tests/testSetProperty.cpp
@@ -9,11 +9,13 @@
 
 BEGIN_TEST(testSetProperty_InheritedGlobalSetter)
 {
-    // This is a JSAPI test because jsapi-test globals do not have a resolve
-    // hook and therefore can use the property cache in some cases where the
-    // shell can't.
+    // This is a JSAPI test because jsapi-test globals can be set up to not have
+    // a resolve hook and therefore can use the property cache in some cases
+    // where the shell can't.
     MOZ_RELEASE_ASSERT(!JS_GetClass(global)->getResolve());
 
+    CHECK(JS::InitRealmStandardClasses(cx));
+
     CHECK(JS_DefineProperty(cx, global, "HOTLOOP", 8, 0));
     EXEC("var n = 0;\n"
          "var global = this;\n"
@@ -25,4 +27,28 @@ BEGIN_TEST(testSetProperty_InheritedGlobalSetter)
          "    throw 'FAIL';\n");
     return true;
 }
+
+const JSClass* getGlobalClass(void) override {
+    static const JSClassOps noResolveGlobalClassOps = {
+        nullptr, // add
+        nullptr, // delete
+        nullptr, // enumerate
+        nullptr, // newEnumerate
+        nullptr, // resolve
+        nullptr, // mayResolve
+        nullptr, // finalize
+        nullptr, // call
+        nullptr, // hasInstance
+        nullptr, // construct
+        JS_GlobalObjectTraceHook
+    };
+
+    static const JSClass noResolveGlobalClass = {
+        "testSetProperty_InheritedGlobalSetter_noResolveGlobalClass",
+        JSCLASS_GLOBAL_FLAGS,
+        &noResolveGlobalClassOps
+    };
+
+    return &noResolveGlobalClass;
+}
 END_TEST(testSetProperty_InheritedGlobalSetter)
diff --git a/js/src/jsapi-tests/tests.cpp b/js/src/jsapi-tests/tests.cpp
index 93bfd384cd3a..904faa0c67f5 100644
--- a/js/src/jsapi-tests/tests.cpp
+++ b/js/src/jsapi-tests/tests.cpp
@@ -95,14 +95,6 @@ JSObject* JSAPITest::createGlobal(JSPrincipals* principals)
         return nullptr;
     }
 
-    JSAutoRealm ar(cx, newGlobal);
-
-    // Populate the global object with the standard globals like Object and
-    // Array.
-    if (!JS::InitRealmStandardClasses(cx)) {
-        return nullptr;
-    }
-
     global = newGlobal;
     return newGlobal;
 }
diff --git a/js/src/jsapi-tests/tests.h b/js/src/jsapi-tests/tests.h
index 1618a5a0669b..a81e60524924 100644
--- a/js/src/jsapi-tests/tests.h
+++ b/js/src/jsapi-tests/tests.h
@@ -261,15 +261,9 @@ class JSAPITest
     JSAPITestString messages() const { return msgs; }
 
     static const JSClass * basicGlobalClass() {
-        static const JSClassOps cOps = {
-            nullptr, nullptr, nullptr, nullptr,
-            nullptr, nullptr, nullptr, nullptr,
-            nullptr, nullptr,
-            JS_GlobalObjectTraceHook
-        };
         static const JSClass c = {
             "global", JSCLASS_GLOBAL_FLAGS,
-            &cOps
+            &JS::DefaultGlobalClassOps
         };
         return &c;
     }
diff --git a/js/src/vm/HelperThreads.cpp b/js/src/vm/HelperThreads.cpp
index 841d08d52b10..0afb53db13f8 100644
--- a/js/src/vm/HelperThreads.cpp
+++ b/js/src/vm/HelperThreads.cpp
@@ -429,16 +429,9 @@ js::HasOffThreadIonCompile(Realm* realm)
 }
 #endif
 
-static const JSClassOps parseTaskGlobalClassOps = {
-    nullptr, nullptr, nullptr, nullptr,
-    nullptr, nullptr, nullptr, nullptr,
-    nullptr, nullptr,
-    JS_GlobalObjectTraceHook
-};
-
 static const JSClass parseTaskGlobalClass = {
     "internal-parse-task-global", JSCLASS_GLOBAL_FLAGS,
-    &parseTaskGlobalClassOps
+    &JS::DefaultGlobalClassOps
 };
 
 ParseTask::ParseTask(ParseTaskKind kind, JSContext* cx,
diff --git a/netwerk/base/ProxyAutoConfig.cpp b/netwerk/base/ProxyAutoConfig.cpp
index 933bc2056338..cb9ac47c4b4a 100644
--- a/netwerk/base/ProxyAutoConfig.cpp
+++ b/netwerk/base/ProxyAutoConfig.cpp
@@ -680,9 +680,6 @@ private:
 
     JSAutoRealm ar(mContext, global);
     AutoPACErrorReporter aper(mContext);
-    if (!JS::InitRealmStandardClasses(mContext)) {
-      return NS_ERROR_FAILURE;
-    }
     if (!JS_DefineFunctions(mContext, global, PACGlobalFunctions)) {
       return NS_ERROR_FAILURE;
     }
@@ -693,17 +690,10 @@ private:
   }
 };
 
-static const JSClassOps sJSContextWrapperGlobalClassOps = {
-  nullptr, nullptr, nullptr, nullptr,
-  nullptr, nullptr, nullptr, nullptr,
-  nullptr, nullptr,
-  JS_GlobalObjectTraceHook
-};
-
 const JSClass JSContextWrapper::sGlobalClass = {
   "PACResolutionThreadGlobal",
   JSCLASS_GLOBAL_FLAGS,
-  &sJSContextWrapperGlobalClassOps
+  &JS::DefaultGlobalClassOps
 };
 
 void
diff --git a/xpcom/tests/gtest/TestGCPostBarriers.cpp b/xpcom/tests/gtest/TestGCPostBarriers.cpp
index 1e2627e38566..2271a8ac7d5b 100644
--- a/xpcom/tests/gtest/TestGCPostBarriers.cpp
+++ b/xpcom/tests/gtest/TestGCPostBarriers.cpp
@@ -84,15 +84,9 @@ RunTest(JSContext* cx, ArrayT* array)
 static void
 CreateGlobalAndRunTest(JSContext* cx)
 {
-  static const JSClassOps GlobalClassOps = {
-    nullptr, nullptr, nullptr, nullptr,
-    nullptr, nullptr, nullptr, nullptr,
-    nullptr, nullptr, JS_GlobalObjectTraceHook
-  };
-
   static const JSClass GlobalClass = {
     "global", JSCLASS_GLOBAL_FLAGS,
-    &GlobalClassOps
+    &JS::DefaultGlobalClassOps
   };
 
   JS::RealmOptions options;