diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 32a49ddef5..00b58daa98 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -316,6 +316,86 @@ jobs:
         name: chrome-stable-mac-test-results
         path: test-results
 
+  firefox_stable_linux:
+    name: "Firefox Stable (Linux)"
+    runs-on: ubuntu-20.04
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v2
+      with:
+        node-version: 10
+    - run: npm ci
+      env:
+        PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD: 1
+    - run: npm run build
+    - run: node lib/cli/cli install-deps firefox
+    - run: node lib/cli/cli install ffmpeg firefox-stable chromium
+    # XVFB-RUN merges both STDOUT and STDERR, whereas we need only STDERR
+    # Wrap `npm run` in a subshell to redirect STDERR to file.
+    - run: xvfb-run --auto-servernum --server-args="-screen 0 1280x960x24" -- bash -c "npm run ftest"
+      env:
+        PWTEST_CHANNEL: "firefox-stable"
+    - run: ./utils/upload_flakiness_dashboard.sh ./test-results/report.json
+      if: always()
+    - uses: actions/upload-artifact@v1
+      if: ${{ always() }}
+      with:
+        name: firefox-stable-linux-test-results
+        path: test-results
+
+  firefox_stable_win:
+    name: "Firefox Stable (Win)"
+    runs-on: windows-latest
+    steps:
+    - name: Install Media Pack
+      shell: powershell
+      run: Install-WindowsFeature Server-Media-Foundation
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v2
+      with:
+        node-version: 10
+    - run: npm ci
+      env:
+        PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD: 1
+    - run: npm run build
+    - run: node lib/cli/cli install ffmpeg firefox-stable chromium
+    - run: npm run ftest
+      shell: bash
+      env:
+        PWTEST_CHANNEL: "firefox-stable"
+    - run: ./utils/upload_flakiness_dashboard.sh ./test-results/report.json
+      if: always()
+      shell: bash
+    - uses: actions/upload-artifact@v1
+      if: ${{ always() }}
+      with:
+        name: firefox-stable-win-test-results
+        path: test-results
+
+  firefox_stable_mac:
+    name: "Firefox Stable (Mac)"
+    runs-on: macos-10.15
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v2
+      with:
+        node-version: 10
+    - run: npm ci
+      env:
+        PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD: 1
+    - run: npm run build
+    - run: node lib/cli/cli install ffmpeg firefox-stable chromium
+    - run: npm run ftest
+      env:
+        PWTEST_CHANNEL: "firefox-stable"
+    - run: ./utils/upload_flakiness_dashboard.sh ./test-results/report.json
+      if: always()
+    - uses: actions/upload-artifact@v1
+      if: ${{ always() }}
+      with:
+        name: firefox-stable-mac-test-results
+        path: test-results
+
   edge_stable_win:
     name: "Edge Stable (Win)"
     runs-on: windows-latest
diff --git a/browsers.json b/browsers.json
index b7545e16ad..54a19360ac 100644
--- a/browsers.json
+++ b/browsers.json
@@ -11,6 +11,11 @@
       "revision": "1245",
       "installByDefault": true
     },
+    {
+      "name": "firefox-stable",
+      "revision": "1242",
+      "installByDefault": false
+    },
     {
       "name": "webkit",
       "revision": "1463",
diff --git a/src/cli/cli.ts b/src/cli/cli.ts
index 21b6306b61..0b37a54309 100755
--- a/src/cli/cli.ts
+++ b/src/cli/cli.ts
@@ -84,18 +84,18 @@ program
 program
     .command('install [browserType...]')
     .description('ensure browsers necessary for this version of Playwright are installed')
-    .action(async function(browserType) {
+    .action(async function(browserTypes) {
       try {
         const allBrowsers = new Set(allBrowserNames);
-        for (const type of browserType) {
-          if (!allBrowsers.has(type)) {
-            console.log(`Invalid browser name: '${type}'. Expecting one of: ${allBrowserNames.map(name => `'${name}'`).join(', ')}`);
+        for (const browserType of browserTypes) {
+          if (!allBrowsers.has(browserType)) {
+            console.log(`Invalid browser name: '${browserType}'. Expecting one of: ${allBrowserNames.map(name => `'${name}'`).join(', ')}`);
             process.exit(1);
           }
         }
-        if (browserType.length && browserType.includes('chromium'))
-          browserType = browserType.concat('ffmpeg');
-        await installBrowsers(browserType.length ? browserType : undefined);
+        if (browserTypes.length && browserTypes.includes('chromium'))
+          browserTypes = browserTypes.concat('ffmpeg');
+        await installBrowsers(browserTypes.length ? browserTypes : undefined);
       } catch (e) {
         console.log(`Failed to install browsers\n${e}`);
         process.exit(1);
diff --git a/src/protocol/channels.ts b/src/protocol/channels.ts
index 1f1932424c..d6980d2f2d 100644
--- a/src/protocol/channels.ts
+++ b/src/protocol/channels.ts
@@ -208,7 +208,7 @@ export interface BrowserTypeChannel extends Channel {
   connectOverCDP(params: BrowserTypeConnectOverCDPParams, metadata?: Metadata): Promise<BrowserTypeConnectOverCDPResult>;
 }
 export type BrowserTypeLaunchParams = {
-  channel?: 'chrome' | 'chrome-beta' | 'chrome-dev' | 'chrome-canary' | 'msedge' | 'msedge-beta' | 'msedge-dev' | 'msedge-canary',
+  channel?: 'chrome' | 'chrome-beta' | 'chrome-dev' | 'chrome-canary' | 'msedge' | 'msedge-beta' | 'msedge-dev' | 'msedge-canary' | 'firefox-stable',
   executablePath?: string,
   args?: string[],
   ignoreAllDefaultArgs?: boolean,
@@ -232,7 +232,7 @@ export type BrowserTypeLaunchParams = {
   slowMo?: number,
 };
 export type BrowserTypeLaunchOptions = {
-  channel?: 'chrome' | 'chrome-beta' | 'chrome-dev' | 'chrome-canary' | 'msedge' | 'msedge-beta' | 'msedge-dev' | 'msedge-canary',
+  channel?: 'chrome' | 'chrome-beta' | 'chrome-dev' | 'chrome-canary' | 'msedge' | 'msedge-beta' | 'msedge-dev' | 'msedge-canary' | 'firefox-stable',
   executablePath?: string,
   args?: string[],
   ignoreAllDefaultArgs?: boolean,
@@ -259,7 +259,7 @@ export type BrowserTypeLaunchResult = {
   browser: BrowserChannel,
 };
 export type BrowserTypeLaunchPersistentContextParams = {
-  channel?: 'chrome' | 'chrome-beta' | 'chrome-dev' | 'chrome-canary' | 'msedge' | 'msedge-beta' | 'msedge-dev' | 'msedge-canary',
+  channel?: 'chrome' | 'chrome-beta' | 'chrome-dev' | 'chrome-canary' | 'msedge' | 'msedge-beta' | 'msedge-dev' | 'msedge-canary' | 'firefox-stable',
   executablePath?: string,
   args?: string[],
   ignoreAllDefaultArgs?: boolean,
@@ -329,7 +329,7 @@ export type BrowserTypeLaunchPersistentContextParams = {
   slowMo?: number,
 };
 export type BrowserTypeLaunchPersistentContextOptions = {
-  channel?: 'chrome' | 'chrome-beta' | 'chrome-dev' | 'chrome-canary' | 'msedge' | 'msedge-beta' | 'msedge-dev' | 'msedge-canary',
+  channel?: 'chrome' | 'chrome-beta' | 'chrome-dev' | 'chrome-canary' | 'msedge' | 'msedge-beta' | 'msedge-dev' | 'msedge-canary' | 'firefox-stable',
   executablePath?: string,
   args?: string[],
   ignoreAllDefaultArgs?: boolean,
diff --git a/src/protocol/protocol.yml b/src/protocol/protocol.yml
index 4beb3a4c76..ef766a9f5e 100644
--- a/src/protocol/protocol.yml
+++ b/src/protocol/protocol.yml
@@ -237,6 +237,7 @@ LaunchOptions:
       - msedge-beta
       - msedge-dev
       - msedge-canary
+      - firefox-stable
     executablePath: string?
     args:
       type: array?
diff --git a/src/protocol/validator.ts b/src/protocol/validator.ts
index 4a47567f73..9194d0c1eb 100644
--- a/src/protocol/validator.ts
+++ b/src/protocol/validator.ts
@@ -154,7 +154,7 @@ export function createScheme(tChannel: (name: string) => Validator): Scheme {
     contentScript: tOptional(tBoolean),
   });
   scheme.BrowserTypeLaunchParams = tObject({
-    channel: tOptional(tEnum(['chrome', 'chrome-beta', 'chrome-dev', 'chrome-canary', 'msedge', 'msedge-beta', 'msedge-dev', 'msedge-canary'])),
+    channel: tOptional(tEnum(['chrome', 'chrome-beta', 'chrome-dev', 'chrome-canary', 'msedge', 'msedge-beta', 'msedge-dev', 'msedge-canary', 'firefox-stable'])),
     executablePath: tOptional(tString),
     args: tOptional(tArray(tString)),
     ignoreAllDefaultArgs: tOptional(tBoolean),
@@ -178,7 +178,7 @@ export function createScheme(tChannel: (name: string) => Validator): Scheme {
     slowMo: tOptional(tNumber),
   });
   scheme.BrowserTypeLaunchPersistentContextParams = tObject({
-    channel: tOptional(tEnum(['chrome', 'chrome-beta', 'chrome-dev', 'chrome-canary', 'msedge', 'msedge-beta', 'msedge-dev', 'msedge-canary'])),
+    channel: tOptional(tEnum(['chrome', 'chrome-beta', 'chrome-dev', 'chrome-canary', 'msedge', 'msedge-beta', 'msedge-dev', 'msedge-canary', 'firefox-stable'])),
     executablePath: tOptional(tString),
     args: tOptional(tArray(tString)),
     ignoreAllDefaultArgs: tOptional(tBoolean),
diff --git a/src/server/firefox/firefox.ts b/src/server/firefox/firefox.ts
index fc6a79e24e..d172a06adc 100644
--- a/src/server/firefox/firefox.ts
+++ b/src/server/firefox/firefox.ts
@@ -18,6 +18,7 @@
 import * as os from 'os';
 import fs from 'fs';
 import path from 'path';
+import { assert } from '../../utils/utils';
 import { FFBrowser } from './ffBrowser';
 import { kBrowserCloseMessageId } from './ffConnection';
 import { BrowserType } from '../browserType';
@@ -31,6 +32,18 @@ export class Firefox extends BrowserType {
     super('firefox', playwrightOptions);
   }
 
+  executablePath(channel?: types.BrowserChannel): string {
+    if (channel) {
+      let executablePath = undefined;
+      if ((channel as any) === 'firefox-stable')
+        executablePath = this._registry.executablePath('firefox-stable');
+      assert(executablePath, `unsupported firefox channel "${channel}"`);
+      assert(fs.existsSync(executablePath), `"${channel}" channel is not installed. Try running 'npx playwright install ${channel}'`);
+      return executablePath;
+    }
+    return super.executablePath(channel);
+  }
+
   _connectToTransport(transport: ConnectionTransport, options: BrowserOptions): Promise<FFBrowser> {
     return FFBrowser.connect(transport, options);
   }
diff --git a/src/server/types.ts b/src/server/types.ts
index d362d1f935..67de5365d2 100644
--- a/src/server/types.ts
+++ b/src/server/types.ts
@@ -252,7 +252,7 @@ export type BrowserContextOptions = {
 
 export type EnvArray = { name: string, value: string }[];
 
-export type BrowserChannel = 'chrome' | 'chrome-beta' | 'chrome-dev' | 'chrome-canary' | 'msedge' | 'msedge-beta' | 'msedge-dev' | 'msedge-canary';
+export type BrowserChannel = 'chrome' | 'chrome-beta' | 'chrome-dev' | 'chrome-canary' | 'msedge' | 'msedge-beta' | 'msedge-dev' | 'msedge-canary' | 'firefox-stable';
 
 type LaunchOptionsBase = {
   channel?: BrowserChannel,
diff --git a/src/server/validateDependencies.ts b/src/server/validateDependencies.ts
index c68d94aa72..965fb122f4 100644
--- a/src/server/validateDependencies.ts
+++ b/src/server/validateDependencies.ts
@@ -47,6 +47,7 @@ const DL_OPEN_LIBRARIES = {
   'webkit': ['libGLESv2.so.2', 'libx264.so'],
   'webkit-technology-preview': ['libGLESv2.so.2', 'libx264.so'],
   'firefox': [],
+  'firefox-stable': [],
   'clank': [],
   'ffmpeg': [],
 };
diff --git a/src/utils/registry.ts b/src/utils/registry.ts
index 4a440178e3..9cf20b6391 100644
--- a/src/utils/registry.ts
+++ b/src/utils/registry.ts
@@ -22,8 +22,8 @@ import * as util from 'util';
 import { getUbuntuVersionSync } from './ubuntuVersion';
 import { assert, getFromENV } from './utils';
 
-export type BrowserName = 'chromium'|'webkit'|'firefox'|'ffmpeg'|'webkit-technology-preview';
-export const allBrowserNames: BrowserName[] = ['chromium', 'webkit', 'firefox', 'ffmpeg', 'webkit-technology-preview'];
+export type BrowserName = 'chromium'|'webkit'|'firefox'|'firefox-stable'|'ffmpeg'|'webkit-technology-preview';
+export const allBrowserNames: BrowserName[] = ['chromium', 'webkit', 'firefox', 'ffmpeg', 'webkit-technology-preview', 'firefox-stable'];
 
 const PACKAGE_PATH = path.join(__dirname, '..', '..');
 
@@ -58,6 +58,17 @@ const EXECUTABLE_PATHS = {
     'win32': ['firefox', 'firefox.exe'],
     'win64': ['firefox', 'firefox.exe'],
   },
+  'firefox-stable': {
+    'ubuntu18.04': ['firefox', 'firefox'],
+    'ubuntu20.04': ['firefox', 'firefox'],
+    'mac10.13': ['firefox', 'Nightly.app', 'Contents', 'MacOS', 'firefox'],
+    'mac10.14': ['firefox', 'Nightly.app', 'Contents', 'MacOS', 'firefox'],
+    'mac10.15': ['firefox', 'Nightly.app', 'Contents', 'MacOS', 'firefox'],
+    'mac11': ['firefox', 'Nightly.app', 'Contents', 'MacOS', 'firefox'],
+    'mac11-arm64': ['firefox', 'Nightly.app', 'Contents', 'MacOS', 'firefox'],
+    'win32': ['firefox', 'firefox.exe'],
+    'win64': ['firefox', 'firefox.exe'],
+  },
   'webkit': {
     'ubuntu18.04': ['pw_run.sh'],
     'ubuntu20.04': ['pw_run.sh'],
@@ -116,6 +127,17 @@ const DOWNLOAD_URLS = {
     'win32': '%s/builds/firefox/%s/firefox-win32.zip',
     'win64': '%s/builds/firefox/%s/firefox-win64.zip',
   },
+  'firefox-stable': {
+    'ubuntu18.04': '%s/builds/firefox-stable/%s/firefox-stable-ubuntu-18.04.zip',
+    'ubuntu20.04': '%s/builds/firefox-stable/%s/firefox-stable-ubuntu-20.04.zip',
+    'mac10.13': '%s/builds/firefox-stable/%s/firefox-stable-mac-10.14.zip',
+    'mac10.14': '%s/builds/firefox-stable/%s/firefox-stable-mac-10.14.zip',
+    'mac10.15': '%s/builds/firefox-stable/%s/firefox-stable-mac-10.14.zip',
+    'mac11': '%s/builds/firefox-stable/%s/firefox-stable-mac-10.14.zip',
+    'mac11-arm64': '%s/builds/firefox-stable/%s/firefox-stable-mac-11.0-arm64.zip',
+    'win32': '%s/builds/firefox-stable/%s/firefox-stable-win32.zip',
+    'win64': '%s/builds/firefox-stable/%s/firefox-stable-win64.zip',
+  },
   'webkit': {
     'ubuntu18.04': '%s/builds/webkit/%s/webkit-ubuntu-18.04.zip',
     'ubuntu20.04': '%s/builds/webkit/%s/webkit-ubuntu-20.04.zip',
@@ -310,6 +332,7 @@ export class Registry {
     const envDownloadHost: { [key: string]: string } = {
       'chromium': 'PLAYWRIGHT_CHROMIUM_DOWNLOAD_HOST',
       'firefox': 'PLAYWRIGHT_FIREFOX_DOWNLOAD_HOST',
+      'firefox-stable': 'PLAYWRIGHT_FIREFOX_DOWNLOAD_HOST',
       'webkit': 'PLAYWRIGHT_WEBKIT_DOWNLOAD_HOST',
       'webkit-technology-preview': 'PLAYWRIGHT_WEBKIT_DOWNLOAD_HOST',
       'ffmpeg': 'PLAYWRIGHT_FFMPEG_DOWNLOAD_HOST',
diff --git a/tests/beforeunload.spec.ts b/tests/beforeunload.spec.ts
index 3f7aff04b7..f66247001a 100644
--- a/tests/beforeunload.spec.ts
+++ b/tests/beforeunload.spec.ts
@@ -61,7 +61,7 @@ it('should run beforeunload if asked for', async ({context, server, isChromium,
   else if (isWebKit)
     expect(dialog.message()).toBe('Leave?');
   else
-    expect(dialog.message()).toBe('This page is asking you to confirm that you want to leave — information you’ve entered may not be saved.');
+    expect(dialog.message()).toContain('This page is asking you to confirm that you want to leave');
   await Promise.all([
     dialog.accept(),
     newPage.waitForEvent('close'),