ToDo: diffs FF143-FF144

[earthlng]

FF144 release date: Oct. 14th 2025

FF144 release notes
FF144 for developers
FF144 security advisories

---

96 diffs ( 48 new, 19 gone, 29 different )

new in v144.0:

pref("browser.search.suggest.ohttp.featureGate", false);
pref("browser.urlbar.yelpRealtime.featureGate", false);

---

ignore

click me for details

==NEW

pref("about.glean.redesign.enabled", false);
pref("browser.newtabpage.activity-stream.discoverystream.dailyBrief.enabled", false);
pref("browser.newtabpage.activity-stream.discoverystream.dailyBrief.sectionId", "top_stories_section");
pref("browser.newtabpage.activity-stream.newtabWallpapers.customWallpaper.theme", "");
pref("browser.newtabpage.activity-stream.weather.placement", "header");
pref("browser.newtabpage.activity-stream.widgets.lists.badge.enabled", false);
pref("browser.newtabpage.activity-stream.widgets.lists.badge.label", "");
pref("browser.safebrowsing.provider.google5.enabled", false);
pref("browser.safebrowsing.provider.google5.gethashURL", "https://safebrowsing.googleapis.com/v5/hashes:search?key=%GOOGLE_SAFEBROWSING_API_KEY%");
pref("browser.safebrowsing.provider.google5.lists", "");
pref("browser.safebrowsing.provider.google5.updateURL", "https://safebrowsing.googleapis.com/v5/hashLists:batchGet?key=%GOOGLE_SAFEBROWSING_API_KEY%");
pref("browser.search.suggest.ohttp.enabled", true);
pref("browser.tabs.dragDrop.pinInteractionCue.delayMS", 500);
pref("browser.urlbar.allowSearchSuggestionsForSimpleOrigins", true);
pref("browser.urlbar.suggest.yelpRealtime", true);
pref("browser.urlbar.yelpRealtime.minKeywordLength", 0);
pref("devtools.anti-tracking.enabled", false);
pref("dom.media.webcodecs.batch-encoding-size", -1);
pref("dom.object_embed.type_hint.enabled", false);
pref("dom.security.framebusting_intervention.enabled", true);
pref("dom.shadowdom.referenceTarget.enabled", false);
pref("dom.storage_access.headers.enabled", false);
pref("dom.webgpu.allow-in-parent", false);
pref("dom.webnotifications.forbid_nested_first_party.enabled", true);
pref("gfx.canvas.accelerated.allow-in-parent", false);
pref("gfx.webrender.swap-chain-allow-tearing", false);
pref("javascript.options.baselinejit.offthread_compilation_strategy", 2);
pref("javascript.options.experimental.upsert", true);
pref("layout.css.ruby.normalize-metrics-factor", 0);
pref("mathml.math_shift.enabled", false);
pref("mathml.rtl_operator_mirroring.enabled", false);
pref("media.cubeb.force_mock_context", false);
pref("media.mkv.enabled", false);
pref("network.auth.sspi_detect_hash", true);
pref("network.http.http2.max_stream_id", 125829120);
pref("network.lna.allow_top_level_navigation", true);
pref("network.mimesniff.extra_moz_html_tags", false);
pref("pdfjs.enableOptimizedPartialRendering", false);
pref("print.cups.monochrome-gtk-simple.enabled", true);
pref("privacy.fingerprintingProtection.testing", false);
pref("privacy.trackingprotection.allow_list.hasUserInteractedWithETPSettings", false);
pref("security.webauthn.always_allow_direct_attestation", false);
pref("toolkit.download.loglevel", "Error");
pref("toolkit.gecko-trace.enable", false);
pref("toolkit.rust-components.logging.crates", "");
pref("toolkit.rust-components.logging.internal-level", "Warn");

==REMOVED, RENAMED or HIDDEN

pref("browser.download.loglevel", "Error");
pref("browser.newtabpage.activity-stream.discoverystream.merino-provider.enabled", true);
pref("browser.newtabpage.activity-stream.discoverystream.onboardingExperience.dismissed", false);
pref("browser.newtabpage.activity-stream.discoverystream.onboardingExperience.enabled", false);
pref("browser.newtabpage.activity-stream.discoverystream.region-bff-config", "US,DE,CA,GB,IE,CH,AT,BE,IN,FR,IT,ES");
pref("browser.newtabpage.activity-stream.discoverystream.spocMessageVariant", "");
pref("browser.newtabpage.activity-stream.feeds.section.topstories.options", "{\"api_key_pref\":\"extensions.pocket.oAuthConsumerKey\",\"hidden\":true,\"provider_icon\":\"chrome://global/skin/icons/help.svg\",\"provider_name\":\"Pocket\",\"read_more_endpoint\":\"https://getpocket.com/explore/trending?src=fx_new_tab\",\"stories_endpoint\":\"https://getpocket.cdn.mozilla.net/v3/firefox/global-recs?version=3&consumer_key=$apiKey&locale_lang=en-US&feed_variant=default_spocs_off\",\"stories_referrer\":\"https://getpocket.com/recommendations\",\"topics_endpoint\":\"https://getpocket.cdn.mozilla.net/v3/firefox/trending-topics?version=2&consumer_key=$apiKey&locale_lang=en-US\",\"show_spocs\":false}");
pref("browser.privatebrowsing.vpnpromourl", "https://vpn.mozilla.org/?utm_source=firefox-browser&utm_medium=firefox-%CHANNEL%-browser&utm_campaign=private-browsing-vpn-link");
pref("dom.block_external_protocol_navigation_from_sandbox", true);
pref("dom.ipc.processPrelaunch.startupDelayMs", 1000);
pref("dom.mutation_events.enabled", false);
pref("dom.mutation_events.forceEnable", "");
pref("extensions.InstallTriggerImpl.enabled", false);
pref("javascript.options.experimental.promise_try", true);
pref("mathml.stixgeneral_operator_stretching.disabled", true);
pref("network.android_doh.autoselect_enabled", false);
pref("privacy.dynamic_firstparty.use_site.include_port", false);
pref("remote.parent-navigation.enabled", true);
pref("security.webauth.webauthn_testing_allow_direct_attestation", false);

==CHANGED

pref("browser.backup.scheduled.minimum-time-between-backups-seconds", 86400); // prev: 3600
pref("browser.contextual-services.contextId.rotation-in-days", 15); // prev: 30
pref("browser.ml.chat.page", true); // prev: false
pref("browser.newtabpage.activity-stream.discoverystream.config", "{\"collapsible\":true,\"enabled\":true}"); // prev: "{\"api_key_pref\":\"extensions.pocket.oAuthConsumerKey\",\"collapsible\":true,\"enabled\":true}"
pref("browser.newtabpage.activity-stream.discoverystream.publisherFavicon.enabled", true); // prev: false
pref("browser.newtabpage.activity-stream.discoverystream.refinedCardsLayout.enabled", true); // prev: false
pref("browser.newtabpage.activity-stream.discoverystream.reportAds.enabled", true); // prev: false
pref("browser.newtabpage.activity-stream.support.url", "https://support.mozilla.org/1/firefox/144.0/WINNT/en-US/new-tab"); // prev: "https://support.mozilla.org/1/firefox/143.0/WINNT/en-US/new-tab"
pref("dom.document.edit_command.contentReadOnly.enabled", false); // prev: true
pref("dom.document.edit_command.insertBrOnReturn.enabled", false); // prev: true
pref("dom.element.commandfor.enabled", true); // prev: false
pref("dom.events.script_execute.enabled", false); // prev: true
pref("dom.movebefore.enabled", true); // prev: false
pref("dom.performance.event_timing.enable_interactionid", true); // prev: false
pref("dom.screenorientation.allow-lock", true); // prev: false
pref("dom.viewTransitions.enabled", true); // prev: false
pref("dom.w3c_pointer_events.getcoalescedevents_only_in_securecontext", true); // prev: false
pref("dom.webgpu.external-texture.enabled", true); // prev: false
pref("gfx.webrender.dithering", true); // prev: false
pref("gfx.webrender.wait-gpu-finished.disabled", false); // prev: true
pref("intl.tsf.hack.extend_setting_selection_range_to_cluster_boundaries", false); // prev: true
pref("media.navigator.video.default_resize_mode", 1); // prev: 0
pref("media.navigator.video.resize_mode.enabled", true); // prev: false
pref("network.predictor.enabled", false); // prev: true
pref("network.proxy.testing_localhost_is_secure_when_hijacked", true); // prev: false
pref("network.socket.ip_addr_any.disabled", true); // prev: false
pref("security.disallow_privilegedabout_remote_script_loads", false); // prev: true
pref("security.sdr.mechanism", 1); // prev: 0
pref("ui.key.layout.load_when_first_needed", true); // prev: false

[earthlng]

some bugzilla tickets

• about.glean.redesign.enabled
  Bug 1930576: add table to about:glean listing each metric, its type, and value
  Revert "Bug 1930576: add table to about:glean listing each metric, its type, and value

• browser.backup.scheduled.minimum-time-between-backups-seconds
  Bug 1983917 - Change backup schedule from 1 hour to 1 day.

• browser.contextual-services.contextId.rotation-in-days
  Bug 1981851 - Default to rotating the context ID every 15 days.
  Bug 1981851 - Default to rotating the context ID every 30 days.
  Revert "Bug 1981851 - Default to rotating the context ID every 30 days.

• browser.ml.chat.page
  Bug 1976553 - set browser.ml.chat.page pref to true
  Revert "Bug 1976553 - set browser.ml.chat.page pref to true
  Bug 1970975 - complete onboarding by running the originally triggered prompt, e.g., summarize page
  Bug 1970229 - add summrize page logics and dismissal new badge for the feature after first click
  Bug 1969278 - Summarize current page button UI
  Revert "Bug 1969278 - Summarize current page button UI

• browser.newtabpage.activity-stream.discoverystream.merino-provider.enabled
  Bug 1984245 - Remove dependency on extensions.pocket... prefs on New Tab

• browser.newtabpage.activity-stream.discoverystream.onboardingExperience.dismissed
  Bug 1983436 - Remove (Pocket) OnboardingExperience component and prefs

• browser.newtabpage.activity-stream.discoverystream.onboardingExperience.enabled
  Bug 1983436 - Remove (Pocket) OnboardingExperience component and prefs

• browser.newtabpage.activity-stream.discoverystream.publisherFavicon.enabled
  Bug 1985593 - Newtab enable new card layouts and favicons

• browser.newtabpage.activity-stream.discoverystream.refinedCardsLayout.enabled
  Bug 1985593 - Newtab enable new card layouts and favicons
  Bug 1965948 - Add feature flag for card layout refinements.

• browser.newtabpage.activity-stream.discoverystream.region-bff-config
  Bug 1984245 - Remove dependency on extensions.pocket... prefs on New Tab

• browser.newtabpage.activity-stream.discoverystream.reportAds.enabled
  Bug 1985594 - Newtab enable report this ad

• browser.newtabpage.activity-stream.discoverystream.spocMessageVariant
  Bug 1983979 - Remove spocMessageVariant experiment from New Tab

• browser.newtabpage.activity-stream.newtabWallpapers.customWallpaper.theme
  Bug 1984690 - Calculate luminosity when uploading custom wallpaper
  Revert "Bug 1984690 - Calculate luminosity when uploading custom wallpaper
  Revert "Bug 1972841 - Calculate luminosity when uploading custom wallpaper

• browser.privatebrowsing.vpnpromourl
  Bug 1983967 - Remove obsolete references to browser.privatebrowsing.vpnpromourl

• browser.safebrowsing.provider.google5.enabled
  Bug 1975181 - Part 1: Introduce prefs for SafeBrowsingV5.

• browser.safebrowsing.provider.google5.gethashURL
  Bug 1975181 - Part 1: Introduce prefs for SafeBrowsingV5.

• browser.safebrowsing.provider.google5.lists
  Bug 1975181 - Part 1: Introduce prefs for SafeBrowsingV5.

• browser.safebrowsing.provider.google5.updateURL
  Bug 1975181 - Part 1: Introduce prefs for SafeBrowsingV5.

• browser.search.suggest.ohttp.enabled
  Bug 1991473 - Add a user preference for OHTTP search suggestions. a=RyanVM DONTBUILD

• browser.search.suggest.ohttp.featureGate
  Bug 1984628 - Add an experiment option for sending search suggestions via Oblivious HTTP.
  Revert "Bug 1987896, Bug 1986021, Bug 1984628 - Ensure that MerinoClient isn't used for search suggestions if OHTTP is not enabled.

• browser.tabs.dragDrop.pinInteractionCue.delayMS
  Bug 1989344 - Increase interaction timer delay, add pref for delayMS and reset interaction timer on mouse move

• browser.urlbar.allowSearchSuggestionsForSimpleOrigins
  Bug 1985941 - Allow remote search suggestions for some search strings that look like simple origins.

• browser.urlbar.suggest.yelpRealtime
  Bug 1986224: Implement opt-in prompt for Yelp realtime suggestion

• browser.urlbar.yelpRealtime.featureGate
  Bug 1986224: Implement opt-in prompt for Yelp realtime suggestion

• browser.urlbar.yelpRealtime.minKeywordLength
  Bug 1986224: Implement opt-in prompt for Yelp realtime suggestion

• devtools.anti-tracking.enabled
  Bug 1972771 - Part 1: Adding a new panel for AntiTracking debugger behind a pref

• dom.block_external_protocol_navigation_from_sandbox
  Bug 1986638 - Remove obsolete pref 'dom.block_external_protocol_navigation_from_sandbox'.

• dom.document.edit_command.contentReadOnly.enabled
  Bug 1986838 - Disable the legacy edit command, contentReadOnly and insertBrOnReturn in all channels

• dom.document.edit_command.insertBrOnReturn.enabled
  Bug 1986838 - Disable the legacy edit command, contentReadOnly and insertBrOnReturn in all channels

• dom.element.commandfor.enabled
  Bug 1983523 - Enable dom.element.commandfor.enabled by default
  Revert (Bug 1983523, Bug 1983512) for causing wpt failures @ math-global-event-handlers.tentative.html
  Bug 1950338 - Part 1: Rename dom.element.invokers flag to dom.element.commandfor
  Revert "Bug 1950338: apply code formatting via Lando" for causing build bustages @CommandEvent.cpp.

• dom.events.script_execute.enabled
  Bug 1584269 - Unship onafterscriptexecute and onbeforescriptexecute events by default;

• dom.ipc.processPrelaunch.startupDelayMs
  Bug 1984500 - Remove separate dom.ipc.processPrelaunch.startupDelayMs pref.

• dom.media.webcodecs.batch-encoding-size
  Bug 1978232 - Enable batch encoding in EncoderAgent and EncoderTemplate

• dom.movebefore.enabled
  Bug 1983688 - Enable moveBefore in release,
  Bug 1923880, ParentNode.moveBefore(),
  Revert "Bug 1923880, ParentNode.moveBefore(),

• dom.mutation_events.enabled
  Bug 769207 - part 14: Get rid of the pref to enable the legacy DOM mutation events and delete tests checking or depending on mutation events

• dom.mutation_events.forceEnable
  Bug 769207 - part 14: Get rid of the pref to enable the legacy DOM mutation events and delete tests checking or depending on mutation events
  Bug 1914513 - Add a pref to disable mutation events,

• dom.object_embed.type_hint.enabled
  Bug 1979536 - Align type attribute behavior closer with other browsers.
  Revert "Bug 1979536 - Align type attribute behavior closer with other browsers.

• dom.performance.event_timing.enable_interactionid
  Bug 1956809 - Enable PerformanceEventTiming.interactionId and let it ride the train

• dom.screenorientation.allow-lock
  Bug 1983483 - Ship screen orientation lock API.

• dom.security.framebusting_intervention.enabled
  Bug 1419501 - Part 1: Add dom.security.framebusting_intervention.enabled pref,

• dom.shadowdom.referenceTarget.enabled
  Bug 1981341 - Add referenceTarget and shadowRootReferenceTarget attributes.

• dom.storage_access.headers.enabled
  Bug 1968722 - Storage-Access-Headers: Set Request header with storage-access state and frame activation
  Revert "Bug 1979307, Bug 1968722 - Storage-Access-Headers: Add "Origin"-header when sending "Sec-Fetch-Storage-Access: inactive"

• dom.viewTransitions.enabled
  Bug 1985809 - Let view transitions ride the trains.

• dom.w3c_pointer_events.getcoalescedevents_only_in_securecontext
  Bug 1986831 - Enable dom.w3c_pointer_events.getcoalescedevents_only_in_securecontext pref in all channels

• dom.webgpu.allow-in-parent
  Bug 1992430 - Disable WebGPU if the GPU process is disabled on platforms with a GPU process. a=RyanVM

• dom.webgpu.external-texture.enabled
  Bug 1986246 - Let WebGPU external textures ride the trains on Macos.
  Bug 1983594 - Enable webgpu external textures on windows.
  Bug 1982866 - Make WebGPU external texture support configurable via a pref and blocklistable.
  Revert "Bug 1982866 - Make WebGPU external texture support configurable via a pref and blocklistable.

• dom.webnotifications.forbid_nested_first_party.enabled
  Bug 1988751 - Forbid notification permission in nested first party iframes a=RyanVM

• extensions.InstallTriggerImpl.enabled
  Bug 1776426 - Remove InstallTrigger implementation

• gfx.canvas.accelerated.allow-in-parent
  Bug 1992856 - Disable remote canvas as the final fallback step before disabling the GPU process. a=RyanVM

• gfx.webrender.dithering
  Bug 1986901 - Let hardware WebRender dithering of gradient ride the trains
  Bug 1984549 - Enable hardware WebRender linear gradient dithering in Nightly
  Bug 1971925 - Add a capability to enable dithering in hardware WebRender

• gfx.webrender.swap-chain-allow-tearing
  Bug 1985197 - Disable DCSwapChain allow tearing and backout Bug 1982661
  Bug 1984709 - Add DXGISwapChain tearing support to DCSwapChain

• gfx.webrender.wait-gpu-finished.disabled
  Bug 1987082 - Set pref gfx.webrender.wait-gpu-finished.disabled to false to avoid too many GPU tasks

• intl.tsf.hack.extend_setting_selection_range_to_cluster_boundaries
  Bug 1987060 - Stop expanding selection range to cluster boundaries either when IME starts composition or when IME sets selection

• javascript.options.baselinejit.offthread_compilation_strategy
  Bug 1980830: Eagerly baseline compile off the main thread when bytecode and jit hints are available.

• javascript.options.experimental.promise_try
  Bug 1928493 - Remove pref for Promise.try;

• javascript.options.experimental.upsert
  Bug 1979917 - Ship Upsert proposal;
  Revert "Bug 1979917 - Update test_xrayToJS.xhtml expectations;

• layout.css.ruby.normalize-metrics-factor
  Bug 1980100 - Convert the layout.css.ruby.normalize-metrics pref into normalize-metrics-factor, a percentage adjustment to apply to the trimmed ascent/descent metrics.

• mathml.math_shift.enabled
  Bug 1923569 - Implement math-shift: compact.
  Revert "Bug 1923569 - Implement math-shift: compact.

• mathml.rtl_operator_mirroring.enabled
  Bug 945183: Mirroring of MathML RTL operators

• mathml.stixgeneral_operator_stretching.disabled
  Bug 1336058 - Remove support for the deprecated STIXGeneral set.

• media.cubeb.force_mock_context
  Bug 1983923 - Allow switching to/from MockCubeb as backend in Gecko.
  Revert "Bug 1983923 - In MockCubeb.h silence some -Wunused-private-field warnings.
  Revert "Bug 1983923 - Allow switching to/from MockCubeb as backend in Gecko.

• media.mkv.enabled
  Bug 1986058 - part1 : add plumbings to support Matroska
  Revert "Bug 1986058: apply code formatting via Lando"
  Revert "Bug 1986058: apply code formatting via Lando" for causing lint failures @ VideoUtils.cpp , VideoUtils.h , MatroskaDecoder.cpp

• media.navigator.video.default_resize_mode
  Bug 1286945 - Enable the resizeMode constraint and make the default value "crop-and-scale".
  Revert "Bug 1286945 - Remove the unused DEFAULT_AUDIO_TIMER_MS" for causing Fenix anc Focus failures on SitePermissionsTest#allowCameraPermissionsTest
  Bug 1433480 - Implement resizeMode constraint (in anticipation of downscaling).

• media.navigator.video.resize_mode.enabled
  Bug 1286945 - Enable the resizeMode constraint and make the default value "crop-and-scale".
  Revert "Bug 1286945 - Remove the unused DEFAULT_AUDIO_TIMER_MS" for causing Fenix anc Focus failures on SitePermissionsTest#allowCameraPermissionsTest
  Bug 1433480 - Hide resizeMode constraint/setting/capability behind a pref.

• network.android_doh.autoselect_enabled
  Bug 1988118 - Move DoHController init and clearing the doh-rollout.* prefs to GeckoView:InitialForeground a=dmeehan

• network.auth.sspi_detect_hash
  Bug 1895277 - Update nsAuthSSPI to check certificate hash algorithm

• network.http.http2.max_stream_id
  Bug 1562885 - Ensure new HTTP/2 proxy session is opened when concurrent stream limit is hit,

• network.lna.allow_top_level_navigation
  Bug 1988525 - Add preference-controlled LNA bypass for top-level navigation.

• network.mimesniff.extra_moz_html_tags
  Bug 1881258 - Make HTML mimesniffing match the spec
  Revert "Bug 1881258 - Make HTML mimesniffing match the spec

• network.predictor.enabled
  Bug 1979415 - disable predictor on nightly and early beta
  Revert "Bug 1979415 - disable predictor on nightly and early beta

• network.proxy.testing_localhost_is_secure_when_hijacked
  Bug 1977997 - default pref network_proxy_testing_localhost_is_secure_when_hijacked to true
  Revert "Bug 1977997 - default pref network_proxy_testing_localhost_is_secure_when_hijacked to true
  Revert "Bug 1977997 - remove pref network_proxy_testing_localhost_is_secure_when_hijacked

• network.socket.ip_addr_any.disabled
  Bug 1984254 - Remove expiring telemetry probes and enable network.socket.ip_addr_any.disabled for all users.

• print.cups.monochrome-gtk-simple.enabled
  Bug 1985667 - Simplify GTK CUPS monochrome implementation.

• privacy.dynamic_firstparty.use_site.include_port
  Bug 1971377 - Remove privacy.dynamic_firstparty.use_site.include_port once it is comfortably in release
  Revert "Bug 1971377 - Remove privacy.dynamic_firstparty.use_site.include_port once it is comfortably in release
  Bug 1970207 - Partitioning by Site should not include the port -

• privacy.fingerprintingProtection.testing
  Bug 1980622: Introduce activeRFPTargets and check active targets through it rather than checking for its effects.

• privacy.trackingprotection.allow_list.hasUserInteractedWithETPSettings
  Bug 1975480 - Part 1: Strict exception onboarding message targeting
  Revert "Bug 1975480 - Part 2: tests for Strict exception onboarding message targeting

• remote.parent-navigation.enabled
  Bug 1971268 - [remote] Remove content process navigation manager
  Bug 1964369 - [bidi] Enable parent process navigation manager for WebDriver BiDi
  Bug 1964369 - [bidi] Rename parent navigation preference to remote.parent-navigation.enabled

• security.disallow_privilegedabout_remote_script_loads
  Bug 1987185 - Make security.disallow_privilegedabout_remote_script_loads atomic and more obviously disabled.

• security.sdr.mechanism
  Bug 1974184 - Switch default SDR mechanism to AES
  Bug 198090 - Part 2: Use AES in the SDR (m-c)

• security.webauth.webauthn_testing_allow_direct_attestation
  Bug 1981587 - expose enterprise policy configurable pref to allow direct attestation. a=RyanVM

• security.webauthn.always_allow_direct_attestation
  Bug 1981587 - expose enterprise policy configurable pref to allow direct attestation. a=RyanVM

• toolkit.download.loglevel
  Bug 1987352 - move download loglevel pref to toolkit, a=dmeehan DONTBUILD

• toolkit.gecko-trace.enable
  Bug 1930954 - Part 6: Add pref to enable tracing system at runtime

• toolkit.rust-components.logging.crates
  Bug 1881344 - Add pref to forward tracing events to the JS console,
  Revert "Bug 1881344 - Add pref to forward tracing events to the JS console,

• toolkit.rust-components.logging.internal-level
  Bug 1881344 - Add pref to forward tracing events to the JS console,
  Revert "Bug 1881344 - Add pref to forward tracing events to the JS console,

• ui.key.layout.load_when_first_needed
  Bug 1986834 - Put it off to load the keyboard layout until it's required