diff --git a/lib/internal/bootstrap/browser.js b/lib/internal/bootstrap/browser.js
index 92c98a7fa9cc55..4df2fa0a495749 100644
--- a/lib/internal/bootstrap/browser.js
+++ b/lib/internal/bootstrap/browser.js
@@ -65,6 +65,13 @@ defineOperation(globalThis, 'clearTimeout', timers.clearTimeout);
 defineOperation(globalThis, 'setInterval', timers.setInterval);
 defineOperation(globalThis, 'setTimeout', timers.setTimeout);
 
+const buffer = require('buffer');
+defineOperation(globalThis, 'atob', buffer.atob);
+defineOperation(globalThis, 'btoa', buffer.btoa);
+
+// https://www.w3.org/TR/FileAPI/#dfn-Blob
+exposeInterface(globalThis, 'Blob', buffer.Blob);
+
 // https://www.w3.org/TR/hr-time-2/#the-performance-attribute
 defineReplacableAttribute(globalThis, 'performance',
                           require('perf_hooks').performance);
diff --git a/lib/internal/bootstrap/node.js b/lib/internal/bootstrap/node.js
index e58538b34cb17e..b434efe0cf4d53 100644
--- a/lib/internal/bootstrap/node.js
+++ b/lib/internal/bootstrap/node.js
@@ -377,14 +377,6 @@ function setupProcessObject() {
     configurable: false,
     value: 'process'
   });
-  // Make process globally available to users by putting it on the global proxy
-  ObjectDefineProperty(globalThis, 'process', {
-    __proto__: null,
-    value: process,
-    enumerable: false,
-    writable: true,
-    configurable: true
-  });
 }
 
 function setupGlobalProxy() {
@@ -399,10 +391,7 @@ function setupGlobalProxy() {
 
 function setupBuffer() {
   const {
-    Blob,
     Buffer,
-    atob,
-    btoa,
   } = require('buffer');
   const bufferBinding = internalBinding('buffer');
 
@@ -410,35 +399,4 @@ function setupBuffer() {
   bufferBinding.setBufferPrototype(Buffer.prototype);
   delete bufferBinding.setBufferPrototype;
   delete bufferBinding.zeroFill;
-
-  ObjectDefineProperties(globalThis, {
-    'Blob': {
-      __proto__: null,
-      value: Blob,
-      enumerable: false,
-      writable: true,
-      configurable: true,
-    },
-    'Buffer': {
-      __proto__: null,
-      value: Buffer,
-      enumerable: false,
-      writable: true,
-      configurable: true,
-    },
-    'atob': {
-      __proto__: null,
-      value: atob,
-      enumerable: false,
-      writable: true,
-      configurable: true,
-    },
-    'btoa': {
-      __proto__: null,
-      value: btoa,
-      enumerable: false,
-      writable: true,
-      configurable: true,
-    },
-  });
 }
diff --git a/src/api/environment.cc b/src/api/environment.cc
index ccdcdefb20fe84..8b914c0082ea8d 100644
--- a/src/api/environment.cc
+++ b/src/api/environment.cc
@@ -447,9 +447,10 @@ MaybeLocal<Value> LoadEnvironment(
 
         // TODO(addaleax): Avoid having a global table for all scripts.
         std::string name = "embedder_main_" + std::to_string(env->thread_id());
-        native_module::NativeModuleEnv::Add(
+        bool added = native_module::NativeModuleEnv::Add(
             name.c_str(),
             UnionBytes(**main_utf16, main_utf16->length()));
+        CHECK(added);
         env->set_main_utf16(std::move(main_utf16));
         std::vector<Local<String>> params = {
             env->process_string(),
diff --git a/test/cctest/test_linked_binding.cc b/test/cctest/test_linked_binding.cc
index 7e40068b5db799..dcdd8554d77838 100644
--- a/test/cctest/test_linked_binding.cc
+++ b/test/cctest/test_linked_binding.cc
@@ -28,15 +28,18 @@ TEST_F(LinkedBindingTest, SimpleTest) {
 
   v8::Local<v8::Context> context = isolate_->GetCurrentContext();
 
-  const char* run_script =
+  v8::Local<v8::Value> completion_value = node::LoadEnvironment(*test_env, [&](const node::StartExecutionCallbackInfo& info) -> v8::MaybeLocal<v8::Value> {
+    const char* run_script =
       "process._linkedBinding('cctest_linkedbinding').key";
-  v8::Local<v8::Script> script = v8::Script::Compile(
-      context,
-      v8::String::NewFromOneByte(isolate_,
-                                 reinterpret_cast<const uint8_t*>(run_script))
-                                 .ToLocalChecked())
-      .ToLocalChecked();
-  v8::Local<v8::Value> completion_value = script->Run(context).ToLocalChecked();
+    v8::Local<v8::Script> script = v8::Script::Compile(
+        context,
+        v8::String::NewFromOneByte(isolate_,
+                                  reinterpret_cast<const uint8_t*>(run_script))
+                                  .ToLocalChecked())
+        .ToLocalChecked();
+    return script->Run(context);
+  }).ToLocalChecked();
+
   v8::String::Utf8Value utf8val(isolate_, completion_value);
   CHECK_NOT_NULL(*utf8val);
   CHECK_EQ(strcmp(*utf8val, "value"), 0);
@@ -69,15 +72,18 @@ TEST_F(LinkedBindingTest, LocallyDefinedLinkedBindingTest) {
 
   v8::Local<v8::Context> context = isolate_->GetCurrentContext();
 
-  const char* run_script =
-      "process._linkedBinding('local_linked').key";
-  v8::Local<v8::Script> script = v8::Script::Compile(
-      context,
-      v8::String::NewFromOneByte(isolate_,
-                                 reinterpret_cast<const uint8_t*>(run_script))
-                                 .ToLocalChecked())
-      .ToLocalChecked();
-  v8::Local<v8::Value> completion_value = script->Run(context).ToLocalChecked();
+  v8::Local<v8::Value> completion_value = node::LoadEnvironment(*test_env, [&](const node::StartExecutionCallbackInfo& info) -> v8::MaybeLocal<v8::Value> {
+    const char* run_script =
+        "process._linkedBinding('local_linked').key";
+    v8::Local<v8::Script> script = v8::Script::Compile(
+        context,
+        v8::String::NewFromOneByte(isolate_,
+                                  reinterpret_cast<const uint8_t*>(run_script))
+                                  .ToLocalChecked())
+        .ToLocalChecked();
+    return script->Run(context);
+  }).ToLocalChecked();
+
   v8::String::Utf8Value utf8val(isolate_, completion_value);
   CHECK_NOT_NULL(*utf8val);
   CHECK_EQ(strcmp(*utf8val, "value"), 0);
@@ -113,15 +119,18 @@ TEST_F(LinkedBindingTest, LocallyDefinedLinkedBindingNapiTest) {
 
   v8::Local<v8::Context> context = isolate_->GetCurrentContext();
 
-  const char* run_script =
-      "process._linkedBinding('local_linked_napi').hello";
-  v8::Local<v8::Script> script = v8::Script::Compile(
-      context,
-      v8::String::NewFromOneByte(isolate_,
-                                 reinterpret_cast<const uint8_t*>(run_script))
-                                 .ToLocalChecked())
-      .ToLocalChecked();
-  v8::Local<v8::Value> completion_value = script->Run(context).ToLocalChecked();
+  v8::Local<v8::Value> completion_value = node::LoadEnvironment(*test_env, [&](const node::StartExecutionCallbackInfo& info) -> v8::MaybeLocal<v8::Value> {
+    const char* run_script =
+        "process._linkedBinding('local_linked_napi').hello";
+    v8::Local<v8::Script> script = v8::Script::Compile(
+        context,
+        v8::String::NewFromOneByte(isolate_,
+                                  reinterpret_cast<const uint8_t*>(run_script))
+                                  .ToLocalChecked())
+        .ToLocalChecked();
+    return script->Run(context);
+  }).ToLocalChecked();
+
   v8::String::Utf8Value utf8val(isolate_, completion_value);
   CHECK_NOT_NULL(*utf8val);
   CHECK_EQ(strcmp(*utf8val, "world"), 0);
@@ -169,17 +178,18 @@ TEST_F(LinkedBindingTest, LocallyDefinedLinkedBindingNapiInstanceDataTest) {
     AddLinkedBinding(*test_env, local_linked_napi_id);
 
     v8::Local<v8::Context> context = isolate_->GetCurrentContext();
+    v8::Local<v8::Value> completion_value = node::LoadEnvironment(*test_env, [&](const node::StartExecutionCallbackInfo& info) -> v8::MaybeLocal<v8::Value> {
+      const char* run_script =
+          "process._linkedBinding('local_linked_napi_id').hello";
+      v8::Local<v8::Script> script = v8::Script::Compile(
+          context,
+          v8::String::NewFromOneByte(isolate_,
+                                    reinterpret_cast<const uint8_t*>(run_script))
+                                    .ToLocalChecked())
+          .ToLocalChecked();
+      return script->Run(context);
+    }).ToLocalChecked();
 
-    const char* run_script =
-        "process._linkedBinding('local_linked_napi_id').hello";
-    v8::Local<v8::Script> script = v8::Script::Compile(
-        context,
-        v8::String::NewFromOneByte(isolate_,
-                                   reinterpret_cast<const uint8_t*>(run_script))
-                                   .ToLocalChecked())
-        .ToLocalChecked();
-    v8::Local<v8::Value> completion_value =
-        script->Run(context).ToLocalChecked();
     CHECK(completion_value->IsExternal());
     instance_data = static_cast<int*>(
         completion_value.As<v8::External>()->Value());
@@ -206,16 +216,19 @@ TEST_F(LinkedBindingTest, ManyBindingsTest) {
 
   v8::Local<v8::Context> context = isolate_->GetCurrentContext();
 
-  const char* run_script =
-      "for (let i = 1; i <= 5; i++)process._linkedBinding(`local_linked${i}`);"
-      "process._linkedBinding('local_linked_napi').hello";
-  v8::Local<v8::Script> script = v8::Script::Compile(
-      context,
-      v8::String::NewFromOneByte(isolate_,
-                                 reinterpret_cast<const uint8_t*>(run_script))
-                                 .ToLocalChecked())
-      .ToLocalChecked();
-  v8::Local<v8::Value> completion_value = script->Run(context).ToLocalChecked();
+  v8::Local<v8::Value> completion_value = node::LoadEnvironment(*test_env, [&](const node::StartExecutionCallbackInfo& info) -> v8::MaybeLocal<v8::Value> {
+    const char* run_script =
+        "for (let i = 1; i <= 5; i++)process._linkedBinding(`local_linked${i}`);"
+        "process._linkedBinding('local_linked_napi').hello";
+    v8::Local<v8::Script> script = v8::Script::Compile(
+        context,
+        v8::String::NewFromOneByte(isolate_,
+                                  reinterpret_cast<const uint8_t*>(run_script))
+                                  .ToLocalChecked())
+        .ToLocalChecked();
+    return script->Run(context);
+  }).ToLocalChecked();
+
   v8::String::Utf8Value utf8val(isolate_, completion_value);
   CHECK_NOT_NULL(*utf8val);
   CHECK_EQ(strcmp(*utf8val, "world"), 0);
diff --git a/test/parallel/test-global.js b/test/parallel/test-global.js
index 3585062bf310e5..5437751cbcc520 100644
--- a/test/parallel/test-global.js
+++ b/test/parallel/test-global.js
@@ -49,6 +49,8 @@ builtinModules.forEach((moduleName) => {
     'clearImmediate',
     'clearInterval',
     'clearTimeout',
+    'atob',
+    'btoa',
     'performance',
     'setImmediate',
     'setInterval',