diff --git a/dom/script/ScriptLoader.cpp b/dom/script/ScriptLoader.cpp
index 0ded6cd45..a9dac1d11 100644
--- a/dom/script/ScriptLoader.cpp
+++ b/dom/script/ScriptLoader.cpp
@@ -120,6 +120,36 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ScriptLoadRequest)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFetchOptions)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
+
+ScriptLoadRequest::ScriptLoadRequest(ScriptKind aKind,
+                                     nsIURI* aURI,
+                                     ScriptFetchOptions* aFetchOptions,
+                                     const SRIMetadata& aIntegrity,
+                                     nsIURI* aReferrer)
+  : mKind(aKind),
+    mScriptMode(ScriptMode::eBlocking),
+    mProgress(Progress::Loading),
+    mIsInline(true),
+    mHasSourceMapURL(false),
+    mInDeferList(false),
+    mInAsyncList(false),
+    mIsNonAsyncScriptInserted(false),
+    mIsXSLT(false),
+    mIsCanceled(false),
+    mWasCompiledOMT(false),
+    mIsTracking(false),
+    mOffThreadToken(nullptr),
+    mScriptTextBuf(nullptr),
+    mScriptTextLength(0),
+    mURI(aURI),
+    mLineNo(1),
+    mIntegrity(aIntegrity),
+    mReferrer(aReferrer),
+    mFetchOptions(aFetchOptions)
+{
+  MOZ_ASSERT(mFetchOptions);
+}
+
 ScriptLoadRequest::~ScriptLoadRequest()
 {
   js_free(mScriptTextBuf);
diff --git a/dom/script/ScriptLoader.h b/dom/script/ScriptLoader.h
index c67a447ff..c65f88910 100644
--- a/dom/script/ScriptLoader.h
+++ b/dom/script/ScriptLoader.h
@@ -92,28 +92,7 @@ public:
                     nsIURI* aURI,
                     ScriptFetchOptions* aFetchOptions,
                     const SRIMetadata& aIntegrity,
-                    nsIURI* aReferrer)
-    : mKind(aKind),
-      mScriptMode(ScriptMode::eBlocking),
-      mProgress(Progress::Loading),
-      mIsInline(true),
-      mHasSourceMapURL(false),
-      mInDeferList(false),
-      mInAsyncList(false),
-      mIsNonAsyncScriptInserted(false),
-      mIsXSLT(false),
-      mIsCanceled(false),
-      mWasCompiledOMT(false),
-      mIsTracking(false),
-      mOffThreadToken(nullptr),
-      mScriptTextBuf(nullptr),
-      mScriptTextLength(0),
-      mURI(aURI),
-      mLineNo(1),
-      mIntegrity(aIntegrity),
-      mReferrer(aReferrer)
-  {
-  }
+                    nsIURI* aReferrer);
 
   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
   NS_DECL_CYCLE_COLLECTION_CLASS(ScriptLoadRequest)
diff --git a/js/src/frontend/ParseNode.cpp b/js/src/frontend/ParseNode.cpp
index 86a57ca01..457bb6f0e 100644
--- a/js/src/frontend/ParseNode.cpp
+++ b/js/src/frontend/ParseNode.cpp
@@ -494,6 +494,8 @@ PushNodeChildren(ParseNode* pn, NodeStack* stack)
       case PNK_EXPORT_SPEC_LIST:
       case PNK_PARAMSBODY:
       case PNK_CLASSMETHODLIST:
+      case PNK_IMPORT_META:
+      case PNK_CALL_IMPORT:
         return PushListNodeChildren(&pn->as<ListNode>(), stack);
 
       // Array comprehension nodes are lists with a single child:
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 922db3a03..ab30ca875 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1395,6 +1395,8 @@ pref("javascript.options.main_thread_stack_quota_cap", 6291456);
 pref("javascript.options.main_thread_stack_quota_cap", 2097152);
 #endif
 
+// Dynamic module import.
+pref("javascript.options.dynamicImport", false);
 
 // advanced prefs
 pref("advanced.mailftp",                    false);