diff --git a/testing/web-platform/meta/MANIFEST.json b/testing/web-platform/meta/MANIFEST.json
index 83f492266ceb..754989e6540a 100644
--- a/testing/web-platform/meta/MANIFEST.json
+++ b/testing/web-platform/meta/MANIFEST.json
@@ -211534,6 +211534,11 @@
      {}
     ]
    ],
+   "content-security-policy/support/file-prefetch-allowed.html": [
+    [
+     {}
+    ]
+   ],
    "content-security-policy/support/fonts.css": [
     [
      {}
@@ -414914,7 +414919,7 @@
    "testharness"
   ],
   "content-security-policy/prefetch-src/prefetch-allowed.html": [
-   "8c88fefbffb6f5270b64cd8d81b405857a9c1123",
+   "45e002cde6f0e61cfc4876fad6d5af7341fec346",
    "testharness"
   ],
   "content-security-policy/prefetch-src/prefetch-blocked.html": [
@@ -415865,6 +415870,10 @@
    "13c3f17f61fa30ac6d7c5c54bd73a6f93d1611c1",
    "support"
   ],
+  "content-security-policy/support/file-prefetch-allowed.html": [
+   "13e9e4ef7ad82d1f9404381a3eeb2a00c319b52a",
+   "support"
+  ],
   "content-security-policy/support/fonts.css": [
    "4577fb4f580bfd9c723e1a5ee0f9d8438ce41ac9",
    "support"
diff --git a/testing/web-platform/meta/content-security-policy/prefetch-src/prefetch-allowed.html.ini b/testing/web-platform/meta/content-security-policy/prefetch-src/prefetch-allowed.html.ini
index a415f8e9ccca..156a36ea2ad2 100644
--- a/testing/web-platform/meta/content-security-policy/prefetch-src/prefetch-allowed.html.ini
+++ b/testing/web-platform/meta/content-security-policy/prefetch-src/prefetch-allowed.html.ini
@@ -1,5 +1,3 @@
 [prefetch-allowed.html]
   prefs: [security.mixed_content.upgrade_display_content:false]
-  [Prefetch succeeds when allowed by prefetch-src]
-    expected: FAIL
-
+  comment: prefetch-src is not supported via meta tag but the test is passing as the tests only tests that 'self' works
diff --git a/testing/web-platform/mozilla/meta/MANIFEST.json b/testing/web-platform/mozilla/meta/MANIFEST.json
index 0af537cf3698..33566d4938c2 100644
--- a/testing/web-platform/mozilla/meta/MANIFEST.json
+++ b/testing/web-platform/mozilla/meta/MANIFEST.json
@@ -1429,7 +1429,7 @@
    "support"
   ],
   "wasm/js/globals.wast.js": [
-   "86b3c907edd8bb3867c5a5aaaebf6066a215b154",
+   "1cb0dc48bd61564325053bf49ae7a1bdb27f5c49",
    "support"
   ],
   "wasm/js/harness/index.js": [
diff --git a/testing/web-platform/tests/content-security-policy/prefetch-src/prefetch-allowed.html b/testing/web-platform/tests/content-security-policy/prefetch-src/prefetch-allowed.html
index e103a9fb2468..95177c13064b 100644
--- a/testing/web-platform/tests/content-security-policy/prefetch-src/prefetch-allowed.html
+++ b/testing/web-platform/tests/content-security-policy/prefetch-src/prefetch-allowed.html
@@ -1,20 +1,27 @@
 <!DOCTYPE html>
 <html>
 <head>
-  <meta http-equiv="Content-Security-Policy" content="prefetch-src 'self'">
   <script src='/resources/testharness.js'></script>
   <script src='/resources/testharnessreport.js'></script>
   <script src='/content-security-policy/support/testharness-helper.js'></script>
   <script src='/content-security-policy/support/prefetch-helper.js'></script>
   <script>
     async_test(t => {
-      let url = window.origin + '/content-security-policy/support/pass.png';
+      var win = window.open('/content-security-policy/support/' +
+                            'file-prefetch-allowed.html');
+      win.addEventListener('load', function () {
+        // Cache control headers are added,since they are needed 
+        // to enable prefetching.
+        let url = '/content-security-policy/support/pass.png' +
+                                  '?pipe=header(Cache-Control, max-age=604800)';
 
-      let link = document.createElement('link');
-      link.rel = 'prefetch';
-      link.href = url;
-
-      assert_link_prefetches(t, link);
+        // Link element is created on the new opened window.
+        let link = win.document.createElement('link');
+        link.rel = 'prefetch';
+        link.href = url;
+        assert_link_prefetches(t, link);
+        win.close();
+      }, false);
     }, 'Prefetch succeeds when allowed by prefetch-src');
   </script>
 </head>
diff --git a/testing/web-platform/tests/content-security-policy/support/file-prefetch-allowed.html b/testing/web-platform/tests/content-security-policy/support/file-prefetch-allowed.html
new file mode 100644
index 000000000000..bd60d262ad8a
--- /dev/null
+++ b/testing/web-platform/tests/content-security-policy/support/file-prefetch-allowed.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <!-- CSP directive 'prefetch-src' is not supported via meta tag though -->
+  <meta http-equiv="Content-Security-Policy" content="prefetch-src 'self'">
+</head>
+<body>
+</body>
+</html>
