diff --git a/playwright/src/test/java/com/microsoft/playwright/TestBrowserContextLocale.java b/playwright/src/test/java/com/microsoft/playwright/TestBrowserContextLocale.java
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+++ b/playwright/src/test/java/com/microsoft/playwright/TestBrowserContextLocale.java
@@ -0,0 +1,171 @@
+/*
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.microsoft.playwright;
+
+import com.microsoft.playwright.options.LoadState;
+import org.junit.jupiter.api.Test;
+
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+import java.util.function.Function;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class TestBrowserContextLocale extends TestBase {
+  @Test
+  void shouldAffectAcceptLanguageHeader() throws ExecutionException, InterruptedException {
+    BrowserContext context = browser.newContext(new Browser.NewContextOptions().setLocale("fr-CH"));
+    Page page = context.newPage();
+    Future<Server.Request> request = server.futureRequest("/empty.html");
+    page.navigate(server.EMPTY_PAGE);
+    assertEquals("fr-CH", request.get().headers.get("accept-language").get(0).substring(0, 5));
+    context.close();
+  }
+
+  @Test
+  void shouldAffectNavigatorLanguage() {
+    BrowserContext context = browser.newContext(new Browser.NewContextOptions().setLocale("fr-CH"));
+    Page page = context.newPage();
+    assertEquals("fr-CH", page.evaluate("() => navigator.language"));
+    context.close();
+  }
+
+
+  @Test
+  void shouldFormatNumber() {
+    {
+      BrowserContext context = browser.newContext(new Browser.NewContextOptions().setLocale("en-US"));
+      Page page = context.newPage();
+      page.navigate(server.EMPTY_PAGE);
+      assertEquals("1,000,000.5", page.evaluate("() => (1000000.50).toLocaleString()"));
+      context.close();
+    }
+    {
+      BrowserContext context = browser.newContext(new Browser.NewContextOptions().setLocale("fr-CH"));
+      Page page = context.newPage();
+      page.navigate(server.EMPTY_PAGE);
+      assertEquals("1 000 000,5", page.evaluate("() => (1000000.50).toLocaleString().replace(/\\s/g, ' ')"));
+      context.close();
+    }
+  }
+
+  @Test
+  void shouldFormatDate() {
+    {
+      BrowserContext context = browser.newContext(new Browser.NewContextOptions()
+        .setLocale("en-US").setTimezoneId("America/Los_Angeles"));
+      Page page = context.newPage();
+      page.navigate(server.EMPTY_PAGE);
+      String formatted = "Sat Nov 19 2016 10:12:34 GMT-0800 (Pacific Standard Time)";
+      assertEquals(formatted, page.evaluate("new Date(1479579154987).toString()"));
+      context.close();
+    }
+    {
+      BrowserContext context = browser.newContext(new Browser.NewContextOptions()
+        .setLocale("de-DE").setTimezoneId("Europe/Berlin"));
+      Page page = context.newPage();
+      page.navigate(server.EMPTY_PAGE);
+      assertEquals("Sat Nov 19 2016 19:12:34 GMT+0100 (Mitteleuropäische Normalzeit)",
+        page.evaluate("new Date(1479579154987).toString()"));
+      context.close();
+    }
+  }
+
+  @Test
+  void shouldFormatNumberInPopups() {
+    BrowserContext context = browser.newContext(new Browser.NewContextOptions().setLocale("fr-CH"));
+    Page page = context.newPage();
+    page.navigate(server.EMPTY_PAGE);
+    Page popup = page.waitForPopup(() -> page.evaluate(
+      "url => window.open(url)", server.PREFIX + "/formatted-number.html"));
+    popup.waitForLoadState(LoadState.DOMCONTENTLOADED);
+    Object result = popup.evaluate("window['result']");
+    assertEquals("1 000 000,5", result);
+    context.close();
+  }
+
+  @Test
+  void shouldAffectNavigatorLanguageInPopups() {
+    BrowserContext context = browser.newContext(new Browser.NewContextOptions().setLocale("fr-CH"));
+    Page page = context.newPage();
+    page.navigate(server.EMPTY_PAGE);
+    Page popup = page.waitForPopup(() -> page.evaluate(
+      "url => window.open(url)", server.PREFIX + "/formatted-number.html"));
+    popup.waitForLoadState(LoadState.DOMCONTENTLOADED);
+    Object result = popup.evaluate("window.initialNavigatorLanguage");
+    assertEquals("fr-CH", result);
+    context.close();
+  }
+
+  @Test
+  void shouldWorkForMultiplePagesSharingSameProcess() {
+    BrowserContext context = browser.newContext(new Browser.NewContextOptions().setLocale("ru-RU"));
+    Page page = context.newPage();
+    page.navigate(server.EMPTY_PAGE);
+    Page popup = page.waitForPopup(() -> page.evaluate(
+      "url => window.open(url)", server.EMPTY_PAGE));
+    popup = page.waitForPopup(() -> page.evaluate(
+      "url => window.open(url)", server.EMPTY_PAGE));
+    context.close();
+  }
+
+  @Test
+  void shouldBeIsolatedBetweenContexts() {
+    BrowserContext context1 = browser.newContext(new Browser.NewContextOptions().setLocale("en-US"));
+    // By default firefox limits number of child web processes to 8.
+    for (int i = 0; i < 8; i++)
+      context1.newPage();
+
+    BrowserContext context2 = browser.newContext(new Browser.NewContextOptions().setLocale("ru-RU"));
+    Page page2 = context2.newPage();
+
+    String localeNumber = "(1000000.50).toLocaleString()";
+     for (Page page : context1.pages()) {
+       assertEquals("1,000,000.5", page.evaluate(localeNumber));
+     }
+    assertEquals("1 000 000,5", page2.evaluate(localeNumber));
+    context1.close();
+    context2.close();
+  }
+
+  @Test
+  void shouldNotChangeDefaultLocaleInAnotherContext() {
+    Function<BrowserContext, String> getContextLocale = (context) -> {
+      Page page = context.newPage();
+      return (String) page.evaluate("(new Intl.NumberFormat()).resolvedOptions().locale");
+    };
+
+    String defaultLocale;
+    {
+      BrowserContext context = browser.newContext();
+      defaultLocale = getContextLocale.apply(context);
+      context.close();
+    }
+    String localeOverride = "ru-RU".equals(defaultLocale) ? "de-DE" : "ru-RU";
+    {
+      BrowserContext context = browser.newContext(new Browser.NewContextOptions().setLocale(localeOverride));
+      assertEquals(localeOverride, getContextLocale.apply(context));
+      context.close();
+    }
+    {
+      BrowserContext context = browser.newContext();
+      assertEquals(defaultLocale, getContextLocale.apply(context));
+      context.close();
+    }
+  }
+}
+