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diff --git a/dom/base/test/jsmodules/test_importedModuleMemoization.html b/dom/base/test/jsmodules/test_importedModuleMemoization.html
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+++ b/dom/base/test/jsmodules/test_importedModuleMemoization.html
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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test imported modules are momoized and only loaded once</title>
+<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+ var results = [];
+
+ SimpleTest.waitForExplicitFinish();
+
+ function arrayEquals(a, b) {
+ if (a.length != b.length) {
+ return false;
+ }
+ for (let i = 0; i < a.length; i++) {
+ if (a[i] != b[i]) {
+ return false;
+ }
+ return true;
+ }
+ }
+
+ function testLoaded() {
+ ok(arrayEquals(results, [1, 2, 3, 4]), 'Check modules only evaluated once');
+ SimpleTest.finish();
+ }
+</script>
+<script type="module" src="module_multiImports.js"></script>
+<script type="module" src="module_multiImports.js"></script>
+<script type="module" src="module_multiImports.js"></script>
+<body onload='testLoaded()'></body>