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diff --git a/dom/tests/mochitest/general/frameStoragePrevented.html b/dom/tests/mochitest/general/frameStoragePrevented.html
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+++ b/dom/tests/mochitest/general/frameStoragePrevented.html
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+
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+<title>frame for storage prevented test</title>
+
+<script type="text/javascript" src="https://example.com/tests/dom/tests/mochitest/general/storagePermissionsUtils.js"></script>
+<script type="text/javascript">
+
+ task(async function() {
+ // We shouldn't be able to access storage
+ await storagePrevented();
+
+ // This hash of the URI is set to #nullprincipal by the test if the current page has a null principal,
+ // and thus attempting to create a dedicated worker will throw
+ if (location.hash == "#nullprincipal") {
+ function createWorker() {
+ return new Promise((resolve, reject) => {
+ var w;
+ try {
+ w = new Worker("workerStoragePrevented.js");
+ } catch (e) {
+ ok(true, "Running workers was prevented");
+ resolve();
+ }
+
+ w.onerror = function() {
+ ok(true, "Running workers was prevented");
+ resolve();
+ }
+ });
+ }
+
+ await createWorker();
+ return;
+ }
+
+ // Try to run a worker, which shouldn't be able to access storage
+ await runWorker("workerStoragePrevented.js");
+ });
+
+</script>
+
+</head>
+
+<body>
+</body>
+</html>