WebDriver/RemoteProtocol/WebDriver BiDi/Milestone 17

WebDriver BiDi Milestone 17 - In Planning

Goal: In this milestone, we are expanding WebDriver BiDi’s emulation features to make it easier to simulate locales, timezones, mobile devices etc. We are also adding support for retrieving network response bodies, which has been strongly requested by clients. Those features benefit existing WebDriver BiDi clients, and are also key requirements for Playwright adoption. Internally we keep supporting Desktop Test Engineering by improving our support for chrome privileged script evaluation and widget-level events.

Progress:

• Tracking spreadsheet

Queries:

• Completed Bugs

Milestone Backlog:

Full Query

ID	Summary	Priority	Fx points	Status	Assigned to
1344267	Marionette test files for chrome scope should not be shipped with Firefox	P2	5	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1511970	Intermittent testing/marionette/harness/marionette_harness/tests/unit/test_chrome_switch_window.py TestSwitchWindowChrome.test_switch_tabs_for_new_background_window_without_focus_change | AssertionError: 0 != 1	P5	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1557232	Intermittent linux testing/marionette/harness/marionette_harness/tests/unit/test_switch_window_{chrome|content}.py TestSwitchToWindow{Chrome|Content}.test_switch_tabs_in_different_windows_with_focus_change | AssertionError: 0 != 1	P5	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1705326	navigator.userAgent still returns custom UA after clearing browsingContext.customUserAgent if a reload happened while the custom UA was set	P3	3	RESOLVED	Alexandra Borovova [:Sasha]
1754273	Emit "browsingContext.contextCreated" events for all open browsing contexts when subscribing to the event	P2	---	RESOLVED	Liam DeBeasi
1841125	`browsingContext.create` fails after abandoned `browsingContext.print` via `browsingContext.close`	P3	3	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1874365	Implement the "browsingContext.downloadWillBegin" event	P2	3	RESOLVED	Julian Descottes [:jdescottes]
1914407	Investigate navigation errors when navigation gets redirected or interrupted	P2	3	RESOLVED	Julian Descottes [:jdescottes]
1931528	Revert workaround for asyncOpenTime=0 in webdriver-bidi	P3	---	RESOLVED	biyul.dev
1938638	Remove deprecated "--enable-crash-reporter" argument from geckodriver	P3	---	RESOLVED	Mauro V [:cheff]
1940738	[wdspec] Add test for network.provideResponse with CORS preflight	P3	2	RESOLVED	Julian Descottes [:jdescottes]
1949037	MessageHandler command broadcast fails with unloaded tabs	P2	2	RESOLVED	Julian Descottes [:jdescottes]
1965465	[wdspec] 2025-Q3 Clean-up meta data for multiple statuses	P3	5	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1967129	Perma /html/user-activation/activation-trigger-mouse-right.html | Activation through right-click mouse event - assert_true: mousedown event should result in activation expected true got false | single tracking bug	P5	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1967785	NetworkDecodedBodySizeMap can throw if called after destroy	P3	1	RESOLVED	Julian Descottes [:jdescottes]
1968855	Add a "widget" event synthesization API for mouse events	P2	3	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1968951	Add an API to BrowsingContext to override locale in JS APIs	P2	5	RESOLVED	Alexandra Borovova [:Sasha]
1968952	Add "emulation.setLocaleOverride" command	P2	5	RESOLVED	Alexandra Borovova [:Sasha]
1969898	Rename Proxy capability class to ProxyConfiguration	P3	---	RESOLVED	sabina
1970293	Implement "browsingContext.downloadEnd" event	P3	3	RESOLVED	Julian Descottes [:jdescottes]
1970330	Add CSP directive for reftest.xhtml to allow removing the exception for CSP checks for Marionette	P2	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1970598	Frequent error "WeakMap key undefined must be an object" in WindowManager	P3	1	RESOLVED	Julian Descottes [:jdescottes]
1971268	Remove content process navigation manager	P2	2	RESOLVED	Julian Descottes [:jdescottes]
1971488	"storage.getCookies" can return cookies with "sameSite=none" and "secure=false" on HTTP pages, but this is invalid for "storage.setCookies"	P2	2	RESOLVED	Alexandra Borovova [:Sasha]
1971778	Implement the network.addDataCollector command	P2	8	RESOLVED	Julian Descottes [:jdescottes]
1971779	Implement the network.disownData command	P2	5	RESOLVED	Julian Descottes [:jdescottes]
1971780	Implement the network.getData command	P2	5	RESOLVED	Julian Descottes [:jdescottes]
1971781	Implement the network.removeDataCollector command	P2	3	RESOLVED	Julian Descottes [:jdescottes]
1972670	Remove FTP proxy support from WebDriver capabilities	P3	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1972742	Perma /screen-orientation/active-lock.html | Unloading an iframe by navigating it must abort the lock promise - promise_rejects_dom: function "function() { throw e; }" threw object "NotSupported | single tracking bug	P5	2	VERIFIED	Henrik Skupin [:whimboo][⌚️UTC+2]
1972865	Add helper in SessionData to check if some session data exists for a module	P3	---	RESOLVED	sabina
1974167	Add "emulation.setScreenOrientationOverride" command	P2	3	RESOLVED	Alexandra Borovova [:Sasha]
1974262	Firefox UI tests call marionette with an outdated argument format	P3	---	RESOLVED	Bas Schouten (:bas.schouten)
1974394	When setting cookies the expiry value is now limited to 400 days	P3	---	RESOLVED	Andrea Marchesini [:baku]
1974534	Perma [tier 2] /css/css-scroll-snap/overscroll-snap.html | snapport covered by snap area doesn't jump - assert_approx_equals: scroller is scrolled to its bottom and not its top. expected 1543 +/- 1 but got 362	P2	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1974535	Perma [tier 2] /css/css-scroll-snap/snap-events/scrollsnapchange/scrollsnapchange-scrolling-non-snapping-axis.tentative.html | wheel scroll on non-snapping axis doesn't trigger scrollsnapchange - expected TIMEOUT	P2	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1975037	Perma [tier 2] /css/css-scroll-snap/snap-after-relayout/multiple-aligned-targets/common-to-both-axes-supercedes-first-in-tree-order.html | single tracking bug	P2	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1975140	Reset scroll position before each test in test_click_scrolling.py	P2	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1976004	Perma /webdriver/tests/bidi/external/permissions/set_permission/set_permission.py | test_set_permission - AssertionError: assert 'granted' == 'prompt' | single tracking bug	P5	2	RESOLVED	Alexandra Borovova [:Sasha]
1976493	Add an API to BrowsingContext to override timezone in JS APIs	P2	8	RESOLVED	Alexandra Borovova [:Sasha]
1976504	Remove support for "localize_entity" from localization module	P3	---	RESOLVED	biyul.dev
1976716	Allow DevTools NetworkResponseListener to stop decoding responses	P2	3	RESOLVED	Julian Descottes [:jdescottes]
1977168	Can't navigate to https URLs with http proxy passed to createUserContext	P2	2	RESOLVED	Alexandra Borovova [:Sasha]
1977180	noProxy set using "browsingContext.createUserContext" doesn't work with host patterns like ".mozilla.org"	P2	2	RESOLVED	Alexandra Borovova [:Sasha]
1977205	Throw an error when trying to add a cookie with "sameSite=none" and "secure=false"	P2	2	RESOLVED	Alexandra Borovova [:Sasha]
1977802	Intermittent /webdriver/tests/bidi/integration/parallel_execution/browsing_context_print.py | test_when_browsingcontext_recreated - Failed: DID NOT RAISE <class 'webdriver.bidi.error.UnknownErrorException'>	P5	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1977978	Use polling to wait for page load status in testing/firefox-ui/tests/functional/security/test_https_first.py to circumvent bug 1945351	P2	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1978027	Implement "emulation.setTimezoneOverride" command	P2	5	RESOLVED	Alexandra Borovova [:Sasha]
1978088	Add new webdriver errors for BiDi network data collection	P2	2	RESOLVED	Julian Descottes [:jdescottes]
1978533	Locale override is not inheritted to newly created cross-origin iframes	P2	3	RESOLVED	Alexandra Borovova [:Sasha]
1978875	DevTools Release Tasks - Cycle 143	P2	3	RESOLVED	Alexandra Borovova [:Sasha]
1979540	Perma [tier 2] testing/firefox-ui/tests/functional/safebrowsing/test_warning_pages.py TestSafeBrowsingWarningPages.test_warning_pages | marionette_driver.errors.TimeoutException: Timed out after 300.0 seconds	P5	---	RESOLVED	Sunil Mayya
1979673	Use fuzzy assert for scroll offset in marionette_harness/tests/unit/test_click_scrolling.py	P3	1	RESOLVED	Julian Descottes [:jdescottes]
1979927	Do not run test cleanup steps if the session has ended in-between	P2	2	RESOLVED	Alexandra Borovova [:Sasha]
1980137	Basic auth credentials are stripped from the URL in the navigationCommitted event	P3	---	RESOLVED	Holger Benl [:hbenl]
1980211	Locale override is sometimes shared between BrowsingContexts	P2	3	RESOLVED	Alexandra Borovova [:Sasha]
1981183	Enable codespell linter for most remote/ folders	P3	1	RESOLVED	Julian Descottes [:jdescottes]
1981210	[mozdevice] Force close a formerly running application to avoid port usage conflicts	--	---	RESOLVED	Joel Maher ( :jmaher ) (UTC -8)
1981657	Add mozilla specific tests to check eviction of network bodies	P2	2	RESOLVED	Julian Descottes [:jdescottes]
1982324	Perma /webdriver/tests/bidi/browsing_context/locate_nodes/start_nodes.py | test_locate_with_svg_context_node[accessibility-value3-expected3] - AssertionError	P5	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1983311	Perma Android TEST-UNEXPECTED-TIMEOUT | /webdriver/tests/bidi/browsing_context/reload/wait.py | expected OK	P5	1	RESOLVED	Julian Descottes [:jdescottes]
1983317	Perma Android /webdriver/tests/bidi/browsing_context/close/prompt_unload.py | test_prompt_unload_triggering_dialog[<type>] - asyncio.exceptions.CancelledError	P5	1	RESOLVED	Alexandra Borovova [:Sasha]
1983414	PDF.js integrations tests using Puppeteer are broken	P2	2	RESOLVED	Julian Descottes [:jdescottes]
1983570	DevTools Release Tasks - Cycle 144	P2	3	RESOLVED	Julian Descottes [:jdescottes]
1983807	Apply the locale and timezone overrides to already created with WebDriver BiDi sandboxes	P2	3	RESOLVED	Alexandra Borovova [:Sasha]
1984866	JS error while running pdf.js unit tests: "TypeError: can't access property Symbol.iterator, this[#collectedNetworkData] is null"	P3	1	RESOLVED	Julian Descottes [:jdescottes]
1984953	Log pollution from content process module events after Session is destroyed	P3	1	RESOLVED	Julian Descottes [:jdescottes]
1985523	Intermittent Android Wd | <random> - setup error: webdriver.error.UnknownErrorException: unknown error (500): Could not launch Android org.mozilla.geckoview.test_runner/.App: Resource temporarily unavailable (os error 11)	P5	2	RESOLVED	Alexandra Borovova [:Sasha]
1985552	The destination of the request for a top-level navigation should be set to "document"	P3	2	RESOLVED	Julian Descottes [:jdescottes]
1985608	[wpt-sync] Sync PR 54552 - wdspec: fix navigate relative_url test to use a relative url	P4	1	RESOLVED	Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)
1985736	Disable webdriver/tests/bidi/network/continue_response/cookies.py on Android 14	P3	1	RESOLVED	Julian Descottes [:jdescottes]
1986022	Encoding of non-ASCII characters in response bodies is broken	P3	2	RESOLVED	Julian Descottes [:jdescottes]
1986025	network.getData fails for empty response body	P2	2	RESOLVED	Julian Descottes [:jdescottes]
1986238	Revert `instant` scroll behavior for "element.scrollIntoView()"	P3	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1986424	The variant `async-event-dispatching` expiration is on 2025-10-01	P3	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1986938	Cancel navigation if it turned into a download	P3	2	RESOLVED	Julian Descottes [:jdescottes]
1986967	[wdspec] Fix blank js template for inline helper	P2	1	RESOLVED	Julian Descottes [:jdescottes]
1987605	Clarify behavior of "isMobile" argument of "browsingContext.setViewport" command on the spec level and check RDM implementation	P2	3	RESOLVED	Alexandra Borovova [:Sasha]
1987777	Firefox app crashes when pressing back button [@ mozilla::WeakPtr<T>::operator bool ]	P2	2	VERIFIED	Alexandra Borovova [:Sasha]
1987935	Implement "emulation.setUserAgentOverride" command	P2	3	RESOLVED	Alexandra Borovova [:Sasha]
1988250	Disable BackupService for Remote Protocol	P2	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+2]
1988681	[wdspec] avoid race conditions with requests blocked in responseStarted phase	P3	2	RESOLVED	Julian Descottes [:jdescottes]
1989563	Introduce a NavigableManager singleton	P2	5	ASSIGNED	Henrik Skupin [:whimboo][⌚️UTC+2]
1989919	Some network events have isBlocked=true even if they are not blocked	P2	2	RESOLVED	Julian Descottes [:jdescottes]

84 Total; 1 Open (1.19%); 81 Resolved (96.43%); 2 Verified (2.38%);