diff --git a/testing/web-platform/tests/FileAPI/blob/Blob-array-buffer.any.js b/testing/web-platform/tests/FileAPI/blob/Blob-array-buffer.any.js
index b72427fd5cfa..2310646e5fde 100644
--- a/testing/web-platform/tests/FileAPI/blob/Blob-array-buffer.any.js
+++ b/testing/web-platform/tests/FileAPI/blob/Blob-array-buffer.any.js
@@ -32,3 +32,14 @@ promise_test(async () => {
   const array_buffer = await blob.arrayBuffer();
   assert_equals_typed_array(new Uint8Array(array_buffer), typed_arr);
 }, "Blob.arrayBuffer() non-unicode input")
+
+promise_test(async () => {
+  const input_arr = new TextEncoder().encode("PASS");
+  const blob = new Blob([input_arr]);
+  const array_buffer_results = await Promise.all([blob.arrayBuffer(),
+      blob.arrayBuffer(), blob.arrayBuffer()]);
+  for (let array_buffer of array_buffer_results) {
+    assert_true(array_buffer instanceof ArrayBuffer);
+    assert_equals_typed_array(new Uint8Array(array_buffer), input_arr);
+  }
+}, "Blob.arrayBuffer() concurrent reads")
diff --git a/testing/web-platform/tests/FileAPI/blob/Blob-stream.any.js b/testing/web-platform/tests/FileAPI/blob/Blob-stream.any.js
index 894f09f8ece4..bd4f8dc40bca 100644
--- a/testing/web-platform/tests/FileAPI/blob/Blob-stream.any.js
+++ b/testing/web-platform/tests/FileAPI/blob/Blob-stream.any.js
@@ -1,5 +1,6 @@
 // META: title=Blob Stream
 // META: script=../support/Blob.js
+// META: script=../../streams/resources/test-utils.js
 'use strict';
 
 // Takes in a ReadableStream and reads from it until it is done, returning
@@ -25,7 +26,7 @@ async function read_all_chunks(stream) {
 
 promise_test(async () => {
   const blob = new Blob(["PASS"]);
-  const stream = await blob.stream()
+  const stream = blob.stream();
   const chunks = await read_all_chunks(stream);
   for (let [index, value] of chunks.entries()) {
     assert_equals(value, "PASS".charCodeAt(index));
@@ -34,9 +35,8 @@ promise_test(async () => {
 
 promise_test(async () => {
   const blob = new Blob();
-  const stream = await blob.stream()
+  const stream = blob.stream();
   const chunks = await read_all_chunks(stream);
-
   assert_array_equals(chunks, []);
 }, "Blob.stream() empty Blob")
 
@@ -44,7 +44,19 @@ promise_test(async () => {
   const input_arr = [8, 241, 48, 123, 151];
   const typed_arr = new Uint8Array(input_arr);
   const blob = new Blob([typed_arr]);
-  const stream = await blob.stream()
+  const stream = blob.stream();
   const chunks = await read_all_chunks(stream);
-  assert_array_equals(chunks, input_arr)
+  assert_array_equals(chunks, input_arr);
 }, "Blob.stream() non-unicode input")
+
+promise_test(async() => {
+  const input_arr = [8, 241, 48, 123, 151];
+  const typed_arr = new Uint8Array(input_arr);
+  let blob = new Blob([typed_arr]);
+  const stream = blob.stream();
+  blob = null;
+  garbageCollect();
+  const chunks = await read_all_chunks(stream);
+  assert_array_equals(chunks, input_arr);
+}, "Blob.stream() garbage collection of blob shouldn't break stream" +
+      "consumption")
diff --git a/testing/web-platform/tests/FileAPI/blob/Blob-text.any.js b/testing/web-platform/tests/FileAPI/blob/Blob-text.any.js
index 960c96054627..d04fa97cffe6 100644
--- a/testing/web-platform/tests/FileAPI/blob/Blob-text.any.js
+++ b/testing/web-platform/tests/FileAPI/blob/Blob-text.any.js
@@ -50,3 +50,15 @@ promise_test(async () => {
   assert_equals(text, "\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd" +
       "\ufffd\ufffd\ufffd\ufffd");
 }, "Blob.text() invalid utf-8 input")
+
+promise_test(async () => {
+  const input_arr = new Uint8Array([192, 193, 245, 246, 247, 248, 249, 250, 251,
+      252, 253, 254, 255]);
+  const blob = new Blob([input_arr]);
+  const text_results = await Promise.all([blob.text(), blob.text(),
+      blob.text()]);
+  for (let text of text_results) {
+    assert_equals(text, "\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd" +
+        "\ufffd\ufffd\ufffd\ufffd");
+  }
+}, "Blob.text() concurrent reads")