Add preference to enable CDP in Firefox by default

dotnet/src/webdriver/Firefox/FirefoxOptions.cs

@@ -88,6 +88,9 @@ public FirefoxOptions()
             this.AddKnownCapabilityName(FirefoxOptions.FirefoxLegacyProfileCapability, "Profile property");
             this.AddKnownCapabilityName(FirefoxOptions.FirefoxLegacyBinaryCapability, "BrowserExecutableLocation property");
             this.AddKnownCapabilityName(FirefoxOptions.FirefoxEnableDevToolsProtocolCapability, "EnableDevToolsProtocol property");
+            // Firefox 129 onwards the CDP protocol will not be enabled by default. Setting this preference will enable it.
+            // https://fxdx.dev/deprecating-cdp-support-in-firefox-embracing-the-future-with-webdriver-bidi/.
+            this.SetPreference("remote.active-protocols", 3);
         }
 
         /// <summary>

java/src/org/openqa/selenium/firefox/FirefoxOptions.java

@@ -63,6 +63,10 @@ public FirefoxOptions() {
     setCapability(CapabilityType.BROWSER_NAME, FIREFOX.browserName());
     setAcceptInsecureCerts(true);
     setCapability("moz:debuggerAddress", true);
+    // Firefox 129 onwards the CDP protocol will not be enabled by default. Setting this preference
+    // will enable it.
+    // https://fxdx.dev/deprecating-cdp-support-in-firefox-embracing-the-future-with-webdriver-bidi/.
+    addPreference("remote.active-protocols", 3);
   }
 
   public FirefoxOptions(Capabilities source) {

javascript/node/selenium-webdriver/firefox.js

@@ -246,6 +246,9 @@ class Options extends Capabilities {
   constructor(other) {
     super(other)
     this.setBrowserName(Browser.FIREFOX)
+    // Firefox 129 onwards the CDP protocol will not be enabled by default. Setting this preference will enable it.
+    // https://fxdx.dev/deprecating-cdp-support-in-firefox-embracing-the-future-with-webdriver-bidi/.
+    this.setPreference('remote.active-protocols', 3)
   }
 
   /**

javascript/node/selenium-webdriver/test/firefox/options_test.js

@@ -87,7 +87,13 @@ suite(
           it('allows setting android activity', function () {
             let options = new firefox.Options().enableMobile()
             let firefoxOptions = options.firefoxOptions_()
-            assert.deepStrictEqual({ androidPackage: 'org.mozilla.firefox' }, firefoxOptions)
+            assert.deepStrictEqual(
+              {
+                androidPackage: 'org.mozilla.firefox',
+                prefs: { 'remote.active-protocols': 3 },
+              },
+              firefoxOptions,
+            )
           })
         })
 

py/selenium/webdriver/firefox/options.py

@@ -41,6 +41,9 @@ def __init__(self) -> None:
         super().__init__()
         self._binary_location = ""
         self._preferences: dict = {}
+        # Firefox 129 onwards the CDP protocol will not be enabled by default. Setting this preference will enable it.
+        # https://fxdx.dev/deprecating-cdp-support-in-firefox-embracing-the-future-with-webdriver-bidi/.
+        self._preferences["remote.active-protocols"] = 3
         self._profile = None
         self.log = Log()
 

py/test/unit/selenium/webdriver/firefox/firefox_options_tests.py

@@ -79,7 +79,7 @@ def test_set_proxy_isnt_in_moz_prefix(options):
 
     caps = options.to_capabilities()
     assert caps["proxy"]["proxyType"] == "manual"
-    assert caps.get("moz:firefoxOptions") is None
+    assert caps.get("moz:firefoxOptions") == {"prefs": {"remote.active-protocols": 3}}
 
 
 def test_raises_exception_if_proxy_is_not_proxy_object(options):

py/test/unit/selenium/webdriver/remote/new_session_tests.py

@@ -52,7 +52,7 @@ def test_works_as_context_manager(mocker):
 
 
 @pytest.mark.parametrize("browser_name", ["firefox", "chrome", "ie"])
-def test_accepts_options_to_remote_driver(mocker, browser_name):
+def test_acepts_options_to_remote_driver(mocker, browser_name):
     options = import_module(f"selenium.webdriver.{browser_name}.options")
     mock = mocker.patch("selenium.webdriver.remote.webdriver.WebDriver.start_session")
 
@@ -103,7 +103,7 @@ def test_first_match_when_2_different_option_types():
                     "browserName": "firefox",
                     "acceptInsecureCerts": True,
                     "moz:debuggerAddress": True,
-                    "moz:firefoxOptions": {"args": ["foo"]},
+                    "moz:firefoxOptions": {"args": ["foo"], "prefs": {"remote.active-protocols": 3}},
                 },
             ],
         }

rb/lib/selenium/webdriver/firefox/options.rb

@@ -64,6 +64,9 @@ def initialize(log_level: nil, **opts)
 
           @options[:args] ||= []
           @options[:prefs] ||= {}
+          # Firefox 129 onwards the CDP protocol will not be enabled by default. Setting this preference will enable it.
+          # https://fxdx.dev/deprecating-cdp-support-in-firefox-embracing-the-future-with-webdriver-bidi/.
+          @options[:prefs]['remote.active-protocols'] = 3
           @options[:env] ||= {}
           @options[:log] ||= {level: log_level} if log_level
 

rb/spec/unit/selenium/webdriver/firefox/driver_spec.rb

@@ -38,7 +38,7 @@ module Firefox
         def expect_request(body: nil, endpoint: nil)
           body = (body || {capabilities: {alwaysMatch: {acceptInsecureCerts: true,
                                                         browserName: 'firefox',
-                                                        'moz:firefoxOptions': {},
+                                                        'moz:firefoxOptions': {prefs: {'remote.active-protocols' => 3}},
                                                         'moz:debuggerAddress': true}}}).to_json
           endpoint ||= "#{service_manager.uri}/session"
           stub_request(:post, endpoint).with(body: body).to_return(valid_response)
@@ -79,7 +79,10 @@ def expect_request(body: nil, endpoint: nil)
           opts = {args: ['-f']}
           expect_request(body: {capabilities: {alwaysMatch: {acceptInsecureCerts: true,
                                                              browserName: 'firefox',
-                                                             'moz:firefoxOptions': opts,
+                                                             'moz:firefoxOptions': {
+                                                               args: ['-f'],
+                                                               prefs: {'remote.active-protocols' => 3}
+                                                             },
                                                              'moz:debuggerAddress': true}}})
           expect { described_class.new(options: Options.new(**opts)) }.not_to raise_exception
         end

rb/spec/unit/selenium/webdriver/firefox/options_spec.rb

@@ -154,7 +154,7 @@ module Firefox
             options.add_preference('intl.accepted_languages', 'en-US')
 
             prefs    = options.as_json['moz:firefoxOptions']['prefs']
-            expected = {'intl.accepted_languages' => 'en-US'}
+            expected = {'intl.accepted_languages' => 'en-US', 'remote.active-protocols' => 3}
             expect(prefs).to eq(expected)
           end
         end
@@ -185,7 +185,7 @@ module Firefox
           it 'returns empty options by default' do
             expect(options.as_json).to eq('browserName' => 'firefox',
                                           'acceptInsecureCerts' => true,
-                                          'moz:firefoxOptions' => {},
+                                          'moz:firefoxOptions' => {'prefs' => {'remote.active-protocols' => 3}},
                                           'moz:debuggerAddress' => true)
           end
 
@@ -195,7 +195,7 @@ module Firefox
                                           'browserName' => 'firefox',
                                           'foo:bar' => {'foo' => 'bar'},
                                           'moz:debuggerAddress' => true,
-                                          'moz:firefoxOptions' => {})
+                                          'moz:firefoxOptions' => {'prefs' => {'remote.active-protocols' => 3}})
           end
 
           it 'converts to a json hash' do
@@ -240,7 +240,7 @@ module Firefox
                                        'moz:debuggerAddress' => true,
                                        key => {'args' => %w[foo bar],
                                                'binary' => '/foo/bar',
-                                               'prefs' => {'foo' => 'bar'},
+                                               'prefs' => {'foo' => 'bar', 'remote.active-protocols' => 3},
                                                'env' => {'FOO' => 'bar'},
                                                'profile' => 'encoded_profile',
                                                'log' => {'level' => 'debug'},