diff --git a/package.json b/package.json
index 85e4f09f7e..e4930037c2 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
     "serve": "http-server -c-1 -s -p 3000 .",
     "test": "server-test test:browser:server 3000 test:all",
     "test:all": "npm-run-all test:browser:*:*",
-    "test:browser": "mocha-headless-chrome -a enable-features=SharedArrayBuffer -a no-sandbox",
+    "test:browser": "mocha-headless-chrome --args=\"--enable-features=SharedArrayBuffer --enable-experimental-web-platform-features --cross-origin-isolated --allow-file-access-from-files\" -a no-sandbox -f http://localhost:3000/tests/ffmpeg-core-mt.test.html",
     "test:browser:core:mt": "npm run test:browser -- -f http://localhost:3000/tests/ffmpeg-core-mt.test.html",
     "test:browser:core:st": "npm run test:browser -- -f http://localhost:3000/tests/ffmpeg-core-st.test.html",
     "test:browser:ffmpeg:mt": "npm run test:browser -- -f http://localhost:3000/tests/ffmpeg-mt.test.html",
diff --git a/tests/ffmpeg.test.js b/tests/ffmpeg.test.js
index 5e20eef88e..fad77c5820 100644
--- a/tests/ffmpeg.test.js
+++ b/tests/ffmpeg.test.js
@@ -6,7 +6,7 @@ const createFFmpeg = async () => {
   const ffmpeg = new FFmpeg();
   await ffmpeg.load({
     coreURL: CORE_URL,
-    thread: FFMPEG_TYPE === "mt",
+    thread: FFMPEG_TYPE === "mt" && crossOriginIsolated,
   });
   return ffmpeg;
 };