diff --git a/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-BroadcastChannel-manual.https.tentative.html b/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-BroadcastChannel-manual.https.tentative.html
index 322b169985bf..07f8d9620d8e 100644
--- a/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-BroadcastChannel-manual.https.tentative.html
+++ b/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-BroadcastChannel-manual.https.tentative.html
@@ -1,5 +1,6 @@
+
diff --git a/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-Error-manual.https.tentative.html b/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-Error-manual.https.tentative.html
index a503c7e87029..19fcb3ea7160 100644
--- a/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-Error-manual.https.tentative.html
+++ b/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-Error-manual.https.tentative.html
@@ -1,5 +1,6 @@
+
diff --git a/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-MessagePort-frames-manual.https.tentative.html b/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-MessagePort-frames-manual.https.tentative.html
index 57299f572723..81e545c5190b 100644
--- a/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-MessagePort-frames-manual.https.tentative.html
+++ b/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-MessagePort-frames-manual.https.tentative.html
@@ -1,5 +1,6 @@
+
diff --git a/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-MessagePort-windows-manual.https.tentative.html b/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-MessagePort-windows-manual.https.tentative.html
index 75756aa130fd..1b583d0c395d 100644
--- a/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-MessagePort-windows-manual.https.tentative.html
+++ b/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-MessagePort-windows-manual.https.tentative.html
@@ -1,5 +1,6 @@
+
diff --git a/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-MessagePort-workers-manual.https.tentative.html b/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-MessagePort-workers-manual.https.tentative.html
index bf637a50ca89..22d0bf5a7231 100644
--- a/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-MessagePort-workers-manual.https.tentative.html
+++ b/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-MessagePort-workers-manual.https.tentative.html
@@ -1,5 +1,6 @@
+
diff --git a/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-frames-manual.https.tentative.html b/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-frames-manual.https.tentative.html
index 1dffe4412184..6d5c5ab78ab8 100644
--- a/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-frames-manual.https.tentative.html
+++ b/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-frames-manual.https.tentative.html
@@ -1,5 +1,6 @@
+
diff --git a/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-windows-manual.https.tentative.html b/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-windows-manual.https.tentative.html
index cf26f67ad1e5..ad1e8e7bcf31 100644
--- a/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-windows-manual.https.tentative.html
+++ b/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-windows-manual.https.tentative.html
@@ -1,5 +1,6 @@
+
diff --git a/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-workers-manual.https.tentative.html b/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-workers-manual.https.tentative.html
index 0ce824a1d449..bc1fc5087a61 100644
--- a/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-workers-manual.https.tentative.html
+++ b/testing/web-platform/tests/native-file-system/native_FileSystemBaseHandle-postMessage-workers-manual.https.tentative.html
@@ -1,5 +1,6 @@
+
diff --git a/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-BroadcastChannel.tentative.https.window.js b/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-BroadcastChannel.tentative.https.window.js
index 1995ab9b1f99..ca25b548cbbb 100644
--- a/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-BroadcastChannel.tentative.https.window.js
+++ b/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-BroadcastChannel.tentative.https.window.js
@@ -3,4 +3,5 @@
// META: script=resources/sandboxed-fs-test-helpers.js
// META: script=resources/messaging-helpers.js
// META: script=resources/messaging-serialize-helpers.js
-// META: script=script-tests/FileSystemBaseHandle-postMessage-BroadcastChannel.js
\ No newline at end of file
+// META: script=script-tests/FileSystemBaseHandle-postMessage-BroadcastChannel.js
+// META: timeout=long
diff --git a/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-Error.tentative.https.window.js b/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-Error.tentative.https.window.js
index f44957e20001..16a7002a2add 100644
--- a/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-Error.tentative.https.window.js
+++ b/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-Error.tentative.https.window.js
@@ -5,4 +5,5 @@
// META: script=resources/messaging-helpers.js
// META: script=resources/messaging-blob-helpers.js
// META: script=resources/messaging-serialize-helpers.js
-// META: script=script-tests/FileSystemBaseHandle-postMessage-Error.js
\ No newline at end of file
+// META: script=script-tests/FileSystemBaseHandle-postMessage-Error.js
+// META: timeout=long
diff --git a/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-MessagePort-frames.tentative.https.window.js b/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-MessagePort-frames.tentative.https.window.js
index e02b575f555e..612c823295b6 100644
--- a/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-MessagePort-frames.tentative.https.window.js
+++ b/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-MessagePort-frames.tentative.https.window.js
@@ -4,3 +4,4 @@
// META: script=resources/messaging-blob-helpers.js
// META: script=resources/messaging-serialize-helpers.js
// META: script=script-tests/FileSystemBaseHandle-postMessage-MessagePort-frames.js
+// META: timeout=long
diff --git a/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-MessagePort-windows.tentative.https.window.js b/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-MessagePort-windows.tentative.https.window.js
index 6d2dc04866de..28cec810ee34 100644
--- a/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-MessagePort-windows.tentative.https.window.js
+++ b/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-MessagePort-windows.tentative.https.window.js
@@ -4,3 +4,4 @@
// META: script=resources/messaging-blob-helpers.js
// META: script=resources/messaging-serialize-helpers.js
// META: script=script-tests/FileSystemBaseHandle-postMessage-MessagePort-windows.js
+// META: timeout=long
diff --git a/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-MessagePort-workers.tentative.https.window.js b/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-MessagePort-workers.tentative.https.window.js
index 119158ef1f6d..1599ba969d87 100644
--- a/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-MessagePort-workers.tentative.https.window.js
+++ b/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-MessagePort-workers.tentative.https.window.js
@@ -5,3 +5,4 @@
// META: script=resources/messaging-blob-helpers.js
// META: script=resources/messaging-serialize-helpers.js
// META: script=script-tests/FileSystemBaseHandle-postMessage-MessagePort-workers.js
+// META: timeout=long
diff --git a/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-frames.tentative.https.window.js b/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-frames.tentative.https.window.js
index cc419e3e1112..a0e41c51b181 100644
--- a/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-frames.tentative.https.window.js
+++ b/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-frames.tentative.https.window.js
@@ -4,3 +4,4 @@
// META: script=resources/messaging-blob-helpers.js
// META: script=resources/messaging-serialize-helpers.js
// META: script=script-tests/FileSystemBaseHandle-postMessage-frames.js
+// META: timeout=long
diff --git a/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-windows.tentative.https.window.js b/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-windows.tentative.https.window.js
index ffebcd8a1222..1e3de1ea399c 100644
--- a/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-windows.tentative.https.window.js
+++ b/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-windows.tentative.https.window.js
@@ -4,3 +4,4 @@
// META: script=resources/messaging-blob-helpers.js
// META: script=resources/messaging-serialize-helpers.js
// META: script=script-tests/FileSystemBaseHandle-postMessage-windows.js
+// META: timeout=long
diff --git a/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-workers.tentative.https.window.js b/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-workers.tentative.https.window.js
index c5e1ef089d07..e690682b6ff7 100644
--- a/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-workers.tentative.https.window.js
+++ b/testing/web-platform/tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-workers.tentative.https.window.js
@@ -5,3 +5,4 @@
// META: script=resources/messaging-blob-helpers.js
// META: script=resources/messaging-serialize-helpers.js
// META: script=script-tests/FileSystemBaseHandle-postMessage-workers.js
+// META: timeout=long