diff --git a/src/modularize.js b/src/modularize.js
index 33a46e08a1054..b9a8414b2ce7c 100644
--- a/src/modularize.js
+++ b/src/modularize.js
@@ -18,7 +18,12 @@ var {{{ EXPORT_NAME }}} = (() => {
   // When MODULARIZE this JS may be executed later,
   // after document.currentScript is gone, so we save it.
   // In EXPORT_ES6 mode we can just use 'import.meta.url'.
+#if MIN_FIREFOX_VERSION < 74 || LEGACY_VM_SUPPORT
+  // This modularize.js script is not Babeled, so manually adapt for old browsers.
+  var _scriptName = typeof document !== 'undefined' && document.currentScript ? document.currentScript.src : undefined;
+#else
   var _scriptName = globalThis.document?.currentScript?.src;
+#endif
   return async function(moduleArg = {}) {
     var moduleRtn;
 
diff --git a/test/browser_reporting.js b/test/browser_reporting.js
index a4bcef8bb8100..90cd6b435ae02 100644
--- a/test/browser_reporting.js
+++ b/test/browser_reporting.js
@@ -125,12 +125,12 @@ if (hasModule) {
     const origPrintErr = Module['printErr'];
 
     Module['print'] = (...args) => {
-      origPrint?.(...args);
+      origPrint && origPrint(args);
       reportStdoutToServer(args.join(' '));
     };
 
     Module['printErr'] = (...args) => {
-      origPrintErr?.(...args);
+      origPrintErr && origPrintErr(args);
       reportStderrToServer(args.join(' '));
     };
   }
diff --git a/tools/file_packager.py b/tools/file_packager.py
index 8eae3ce6a33ac..ca57f7b19d5b1 100755
--- a/tools/file_packager.py
+++ b/tools/file_packager.py
@@ -1017,7 +1017,7 @@ def generate_preload_js(data_target, data_files, metadata):
       # is async, so we handle both orderings.
       ret += '''
       var fetchPromise;
-      var fetched = Module['getPreloadedPackage']?.(REMOTE_PACKAGE_NAME, REMOTE_PACKAGE_SIZE);
+      var fetched = Module['getPreloadedPackage'] && Module['getPreloadedPackage'](REMOTE_PACKAGE_NAME, REMOTE_PACKAGE_SIZE);
 
       if (!fetched) {
         // Note that we don't use await here because we want to execute the