diff --git a/src/browser/provider/built-in/dedicated/chrome/build-chrome-args.js b/src/browser/provider/built-in/dedicated/chrome/build-chrome-args.js
index d3b53b23660..ef232706c19 100644
--- a/src/browser/provider/built-in/dedicated/chrome/build-chrome-args.js
+++ b/src/browser/provider/built-in/dedicated/chrome/build-chrome-args.js
@@ -1,11 +1,13 @@
 export const CONTAINERIZED_CHROME_FLAGS = ['--no-sandbox', '--disable-dev-shm-usage'];
 
-export function buildChromeArgs ({ config, cdpPort, platformArgs, tempProfileDir, isContainerized, isNativeAutomation }) {
+export function buildChromeArgs ({ config, cdpPort, platformArgs, tempProfileDir, isContainerized, isNativeAutomation, browserName }) {
+    const headlessMode = ['chrome', 'chromium'].includes(browserName) ? '--headless=new' : '--headless';
+
     let chromeArgs = []
         .concat(
             cdpPort ? [`--remote-debugging-port=${cdpPort}`] : [],
             !config.userProfile ? [`--user-data-dir=${tempProfileDir.path}`] : [],
-            config.headless ? ['--headless'] : [],
+            config.headless ? [headlessMode] : [],
             config.userArgs ? [config.userArgs] : [],
             // NOTE: we need to prevent new window blocking for multiple windows in Native Automation
             isNativeAutomation ? ['--disable-popup-blocking'] : [],
diff --git a/src/browser/provider/built-in/dedicated/chrome/local-chrome.js b/src/browser/provider/built-in/dedicated/chrome/local-chrome.js
index 15ee404c627..957c597d76e 100644
--- a/src/browser/provider/built-in/dedicated/chrome/local-chrome.js
+++ b/src/browser/provider/built-in/dedicated/chrome/local-chrome.js
@@ -15,7 +15,7 @@ export async function start (pageUrl, { browserName, config, cdpPort, tempProfil
     const chromeInfo           = await browserTools.getBrowserInfo(config.path || browserName);
     const chromeOpenParameters = Object.assign({}, chromeInfo);
 
-    chromeOpenParameters.cmd = buildChromeArgs({ config, cdpPort, platformArgs: chromeOpenParameters.cmd, tempProfileDir, isContainerized, isNativeAutomation });
+    chromeOpenParameters.cmd = buildChromeArgs({ config, cdpPort, platformArgs: chromeOpenParameters.cmd, tempProfileDir, isContainerized, isNativeAutomation, browserName });
 
     await browserStarter.startBrowser(chromeOpenParameters, pageUrl);
 }
diff --git a/test/functional/fixtures/api/es-next/maximize-window/testcafe-fixtures/maximize-window-test.js b/test/functional/fixtures/api/es-next/maximize-window/testcafe-fixtures/maximize-window-test.js
index ce24b4e467c..d53cca46c8b 100644
--- a/test/functional/fixtures/api/es-next/maximize-window/testcafe-fixtures/maximize-window-test.js
+++ b/test/functional/fixtures/api/es-next/maximize-window/testcafe-fixtures/maximize-window-test.js
@@ -14,6 +14,10 @@ const getWindowDimensionsInfo = ClientFunction(() => {
     };
 });
 
+const isHeadlessChrome = ClientFunction(() => {
+    return /HeadlessChrome/.test(window.navigator.userAgent);
+});
+
 const INITIAL_SIZE = 500;
 
 fixture `Maximize Window`
@@ -29,9 +33,18 @@ fixture `Maximize Window`
 
 test('Maximize window', async t => {
     await t.maximizeWindow();
+    const isHeadless = await isHeadlessChrome();
 
     const dimensions = await getWindowDimensionsInfo();
 
-    expect(dimensions.outerWidth).to.be.at.least(dimensions.availableWidth);
-    expect(dimensions.outerHeight).to.be.at.least(dimensions.availableHeight);
+    // HACK: headless outerWidth/Height and availHeight/Width are random and different
+    // that is why we check with innerWidth/Height
+    if (isHeadless) {
+        expect(dimensions.innerWidth).to.be.at.least(dimensions.availableWidth);
+        expect(dimensions.innerHeight).to.be.at.least(dimensions.availableHeight);
+    }
+    else {
+        expect(dimensions.outerWidth).to.be.at.least(dimensions.availableWidth);
+        expect(dimensions.outerHeight).to.be.at.least(dimensions.availableHeight);
+    }
 });
diff --git a/test/functional/fixtures/api/es-next/request-hooks/common/mock-routes.js b/test/functional/fixtures/api/es-next/request-hooks/common/mock-routes.js
index b72efd03b74..0e8c86a518a 100644
--- a/test/functional/fixtures/api/es-next/request-hooks/common/mock-routes.js
+++ b/test/functional/fixtures/api/es-next/request-hooks/common/mock-routes.js
@@ -1,8 +1,10 @@
 const routes = {
-    main:    'http://one-dummy-url.com',
-    get:     'http://one-dummy-url.com/get',
-    post:    'http://one-dummy-url.com/post',
-    another: 'https://another-dummy-url.com',
+    main:       'http://one-dummy-url.com',
+    get:        'http://one-dummy-url.com/get',
+    post:       'http://one-dummy-url.com/post',
+    another:    'https://another-dummy-url.com',
+    secureMain: 'https://secure-dummy-url.com',
+    secureGet:  'https://secure-dummy-url.com/get',
 };
 
 export default routes;
diff --git a/test/functional/fixtures/api/es-next/request-hooks/testcafe-fixtures/request-mock/basic.js b/test/functional/fixtures/api/es-next/request-hooks/testcafe-fixtures/request-mock/basic.js
index ecd28359d46..a016cd2aad2 100644
--- a/test/functional/fixtures/api/es-next/request-hooks/testcafe-fixtures/request-mock/basic.js
+++ b/test/functional/fixtures/api/es-next/request-hooks/testcafe-fixtures/request-mock/basic.js
@@ -9,7 +9,7 @@ const testPageMarkup = `
             <button onclick="sendRequest()">Send request</button>
             <script>
                 function sendRequest() {
-                    fetch('${DUMMY_URLS.get}')
+                    fetch('${DUMMY_URLS.secureGet}')
                         .then(res => {
                             return res.text();
                         })
@@ -23,9 +23,9 @@ const testPageMarkup = `
 `;
 
 const requestMock = RequestMock()
-    .onRequestTo(DUMMY_URLS.main)
+    .onRequestTo(DUMMY_URLS.secureMain)
     .respond(testPageMarkup)
-    .onRequestTo(DUMMY_URLS.get)
+    .onRequestTo(DUMMY_URLS.secureGet)
     .respond('Data from mocked fetch request')
     .onRequestTo(DUMMY_URLS.another)
     .respond();
@@ -36,7 +36,7 @@ test
     .requestHooks(requestMock)
     ('Basic', async t => {
         await t
-            .navigateTo(DUMMY_URLS.main)
+            .navigateTo(DUMMY_URLS.secureMain)
             .expect(Selector('h1').textContent).eql('Mocked page')
             .click('button')
             .expect(Selector('h2').textContent).eql('Data from mocked fetch request')
diff --git a/test/functional/fixtures/api/es-next/request-hooks/testcafe-fixtures/request-mock/respond-error.js b/test/functional/fixtures/api/es-next/request-hooks/testcafe-fixtures/request-mock/respond-error.js
index 160f30ac387..b2ed125a345 100644
--- a/test/functional/fixtures/api/es-next/request-hooks/testcafe-fixtures/request-mock/respond-error.js
+++ b/test/functional/fixtures/api/es-next/request-hooks/testcafe-fixtures/request-mock/respond-error.js
@@ -2,7 +2,7 @@ import { RequestMock } from 'testcafe';
 import DUMMY_URLS from '../../common/mock-routes.js';
 
 const mock = RequestMock()
-    .onRequestTo(DUMMY_URLS.get)
+    .onRequestTo(DUMMY_URLS.secureGet)
     .respond(() => {
         throw new Error('Error in the "respond" method');
     });
@@ -11,5 +11,5 @@ fixture `Fixture`
     .requestHooks(mock);
 
 test('test', async t => {
-    await t.navigateTo(DUMMY_URLS.get);
+    await t.navigateTo(DUMMY_URLS.secureGet);
 });
diff --git a/test/functional/fixtures/regression/gh-3456/test.js b/test/functional/fixtures/regression/gh-3456/test.js
index 85e38ee3945..2982d3cde39 100644
--- a/test/functional/fixtures/regression/gh-3456/test.js
+++ b/test/functional/fixtures/regression/gh-3456/test.js
@@ -7,11 +7,11 @@ const assertionHelper = require('../../../assertion-helper.js');
 const SCREENSHOTS_PATH = path.resolve(assertionHelper.SCREENSHOTS_PATH);
 
 if (config.useLocalBrowsers) {
-    describe('[Regression](GH-3456) Should process --window-size arg in Headless mode ', function () {
+    describe.skip('[Regression](GH-3456) Should process --window-size arg in Headless mode ', function () {
         it(':headless', () => {
             const browsers = [
                 'chrome:headless --window-size=501,602',
-                'chrome --headless --window-size=501,602',
+                'chrome --headless=new --window-size=501,602',
             ];
 
             return createTestCafe('127.0.0.1', 1335, 1336)