diff --git a/browsers.json b/browsers.json
index 17cce0d9d4..06395b1169 100644
--- a/browsers.json
+++ b/browsers.json
@@ -8,7 +8,7 @@
     },
     {
       "name": "firefox",
-      "revision": "1173",
+      "revision": "1174",
       "download": true
     },
     {
diff --git a/test/workers.spec.ts b/test/workers.spec.ts
index c5c993d90b..df43d5ec9e 100644
--- a/test/workers.spec.ts
+++ b/test/workers.spec.ts
@@ -16,6 +16,7 @@
  */
 
 import { it, expect } from './fixtures';
+import { attachFrame } from './utils';
 import type { ConsoleMessage } from '..';
 
 it('Page.workers', async function({page, server}) {
@@ -106,6 +107,23 @@ it('should clear upon cross-process navigation', async function({server, page})
   expect(page.workers().length).toBe(0);
 });
 
+it('should attribute network activity for worker inside iframe to the iframe', (test, {browserName}) => {
+  test.fixme(browserName === 'firefox' || browserName === 'chromium');
+}, async function({page, server}) {
+  await page.goto(server.PREFIX + '/empty.html');
+  const [worker, frame] = await Promise.all([
+    page.waitForEvent('worker'),
+    attachFrame(page, 'frame1', server.PREFIX + '/worker/worker.html'),
+  ]);
+  const url = server.PREFIX + '/one-style.css';
+  const [request] = await Promise.all([
+    page.waitForRequest(url),
+    worker.evaluate(url => fetch(url).then(response => response.text()).then(console.log), url),
+  ]);
+  expect(request.url()).toBe(url);
+  expect(request.frame()).toBe(frame);
+});
+
 it('should report network activity', async function({page, server}) {
   const [worker] = await Promise.all([
     page.waitForEvent('worker'),