diff --git a/tests/page/page-network-request.spec.ts b/tests/page/page-network-request.spec.ts
index 624e36abfd..d3679ed14a 100644
--- a/tests/page/page-network-request.spec.ts
+++ b/tests/page/page-network-request.spec.ts
@@ -19,6 +19,14 @@ import { test as it, expect } from './pageTest';
 import { attachFrame } from '../config/utils';
 import fs from 'fs';
 
+function adjustServerHeaders(headers: Object, browserName: string, channel: string) {
+  if (browserName === 'firefox' && channel === 'firefox-beta') {
+    // This is a new experimental feature, only enabled in Firefox Beta for now.
+    delete headers['priority'];
+  }
+  return headers;
+}
+
 it('should work for main frame navigation request', async ({ page, server }) => {
   const requests = [];
   page.on('request', request => requests.push(request));
@@ -82,7 +90,7 @@ it('should return headers', async ({ page, server, browserName }) => {
     expect(response.request().headers()['user-agent']).toContain('WebKit');
 });
 
-it('should get the same headers as the server', async ({ page, server, browserName, platform, isElectron, browserMajorVersion }) => {
+it('should get the same headers as the server', async ({ page, server, browserName, platform, isElectron, browserMajorVersion, channel }) => {
   it.skip(isElectron && browserMajorVersion < 99, 'This needs Chromium >= 99');
   it.fail(browserName === 'webkit' && platform === 'win32', 'Curl does not show accept-encoding and accept-language');
   let serverRequest;
@@ -92,10 +100,10 @@ it('should get the same headers as the server', async ({ page, server, browserNa
   });
   const response = await page.goto(server.PREFIX + '/empty.html');
   const headers = await response.request().allHeaders();
-  expect(headers).toEqual(serverRequest.headers);
+  expect(headers).toEqual(adjustServerHeaders(serverRequest.headers, browserName, channel));
 });
 
-it('should not return allHeaders() until they are available', async ({ page, server, browserName, platform, isElectron, browserMajorVersion }) => {
+it('should not return allHeaders() until they are available', async ({ page, server, browserName, platform, isElectron, browserMajorVersion, channel }) => {
   it.skip(isElectron && browserMajorVersion < 99, 'This needs Chromium >= 99');
   it.fail(browserName === 'webkit' && platform === 'win32', 'Curl does not show accept-encoding and accept-language');
 
@@ -114,13 +122,13 @@ it('should not return allHeaders() until they are available', async ({ page, ser
 
   await page.goto(server.PREFIX + '/empty.html');
   const requestHeaders = await requestHeadersPromise;
-  expect(requestHeaders).toEqual(serverRequest.headers);
+  expect(requestHeaders).toEqual(adjustServerHeaders(serverRequest.headers, browserName, channel));
 
   const responseHeaders = await responseHeadersPromise;
   expect(responseHeaders['foo']).toBe('bar');
 });
 
-it('should get the same headers as the server CORS', async ({ page, server, browserName, platform, isElectron, browserMajorVersion }) => {
+it('should get the same headers as the server CORS', async ({ page, server, browserName, platform, isElectron, browserMajorVersion, channel }) => {
   it.skip(isElectron && browserMajorVersion < 99, 'This needs Chromium >= 99');
   it.fail(browserName === 'webkit' && platform === 'win32', 'Curl does not show accept-encoding and accept-language');
 
@@ -139,7 +147,7 @@ it('should get the same headers as the server CORS', async ({ page, server, brow
   expect(text).toBe('done');
   const response = await responsePromise;
   const headers = await response.request().allHeaders();
-  expect(headers).toEqual(serverRequest.headers);
+  expect(headers).toEqual(adjustServerHeaders(serverRequest.headers, browserName, channel));
 });
 
 it('should not get preflight CORS requests when intercepting', async ({ page, server, browserName, isAndroid }) => {
@@ -353,7 +361,7 @@ it('should return navigation bit when navigating to image', async ({ page, serve
   expect(requests[0].isNavigationRequest()).toBe(true);
 });
 
-it('should report raw headers', async ({ page, server, browserName, platform, isElectron, browserMajorVersion }) => {
+it('should report raw headers', async ({ page, server, browserName, platform, isElectron, browserMajorVersion, channel }) => {
   it.skip(isElectron && browserMajorVersion < 99, 'This needs Chromium >= 99');
 
   let expectedHeaders: { name: string, value: string }[];
@@ -376,6 +384,10 @@ it('should report raw headers', async ({ page, server, browserName, platform, is
         return { name, value: values[0] };
       });
     }
+    if (browserName === 'firefox' && channel === 'firefox-beta') {
+      // This is a new experimental feature, only enabled in Firefox Beta for now.
+      expectedHeaders = expectedHeaders.filter(({ name }) => name.toLowerCase() !== 'priority');
+    }
     res.end();
   });
   await page.goto(server.EMPTY_PAGE);