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FF140 release date: Jun. 24th 2025
FF140 release notes
FF140 for developers
FF140 security advisories
126 diffs ( 63 new, 35 gone, 28 different )
- pref("security.csp.reporting.enabled", true); - 1964249, also see security.csp.reporting.enabled #1981 - 8f524d6
new in v140.0:
0806
pref("browser.urlbar.mdn.featureGate", false); - 1966811 not new - 8ea88490105
pref("browser.newtabpage.activity-stream.showSponsoredCheckboxes", true); - 1964294 bcc852d- FYI
- pref("places.semanticHistory.featureGate", false);
- semantic history is some sort of ML/AI driven results: e.g if you had spotify or soundcloud in your history, and you searched/typed
audio
it might suggest those
- semantic history is some sort of ML/AI driven results: e.g if you had spotify or soundcloud in your history, and you searched/typed
- pref("browser.newtabpage.activity-stream.telemetry.privatePing.inferredInterests.enabled", false);
- pref("places.semanticHistory.featureGate", false);
removed, renamed or hidden in v140.0:
changed in v140.0:
0806
IIUIC these now become regional - 1966811- pref("browser.urlbar.addons.featureGate", false); // prev: true
- pref("browser.urlbar.weather.featureGate", false); // prev: true
- pref("browser.urlbar.yelp.featureGate", false); // prev: true
- FYI
- pref("dom.serviceWorkers.privateBrowsing.enabled", true); // prev: false YAY!!
ignore
click me for details
==NEW
pref("browser.contextual-services.contextId.rotation-in-days", 0);
pref("browser.contextual-services.contextId.rust-component.enabled", false);
pref("browser.ml.linkPreview.collapsed", false);
pref("browser.ml.linkPreview.ignoreMs", 2000);
pref("browser.ml.linkPreview.longPress", true);
pref("browser.ml.linkPreview.longPressMs", 1000);
pref("browser.ml.linkPreview.optin", false);
pref("browser.ml.linkPreview.recentTypingMs", 1000);
pref("browser.ml.linkPreview.shift", true);
pref("browser.ml.linkPreview.shiftAlt", false);
pref("browser.newtabpage.activity-stream.discoverystream.merino-provider.ohttp.enabled", false);
pref("browser.newtabpage.activity-stream.discoverystream.ohttp.configURL", "https://prod.ohttp-gateway.prod.webservices.mozgcp.net/ohttp-configs");
pref("browser.newtabpage.activity-stream.discoverystream.ohttp.relayURL", "https://mozilla-ohttp.fastly-edge.com/");
pref("browser.newtabpage.activity-stream.discoverystream.placements.contextualSpocs", "newtab_stories_1, newtab_stories_2, newtab_stories_3, newtab_stories_4, newtab_stories_5, newtab_stories_6");
pref("browser.newtabpage.activity-stream.discoverystream.placements.contextualSpocs.counts", "1, 1, 1, 1, 1, 1");
pref("browser.newtabpage.activity-stream.discoverystream.refinedCardsLayout.enabled", false);
pref("browser.newtabpage.activity-stream.discoverystream.sections.contextualAds.enabled", false);
pref("browser.newtabpage.activity-stream.discoverystream.sections.contextualAds.locale-config", "en-US,en-GB,en-CA");
pref("browser.newtabpage.activity-stream.discoverystream.sections.contextualAds.region-config", "");
pref("browser.newtabpage.activity-stream.discoverystream.sections.personalization.inferred.model.override", "");
pref("browser.newtabpage.activity-stream.feeds.inferredpersonalizationfeed", true);
pref("browser.newtabpage.activity-stream.system.showSponsoredCheckboxes", false); // toggles the UI
pref("browser.newtabpage.activity-stream.telemetry.privatePing.maxSubmissionDelayMs", 5000);
pref("browser.newtabpage.activity-stream.telemetry.privatePing.redactNewtabPing.enabled", false);
pref("browser.newtabpage.activity-stream.unifiedAds.ohttp.enabled", false);
pref("browser.urlbar.suggest.semanticHistory.minLength", 5);
pref("browser.urlbar.update2.engineAliasRefresh", true);
pref("browser.urlbar.yelp.serviceResultDistinction", false);
pref("dom.cookieStore.extra.enabled", false);
pref("dom.dialog.light-dismiss.enabled", false);
pref("dom.event.mouse.boundary.restore_last_over_target_from_temporary_removal", false);
pref("dom.event.pointer.boundary.dispatch_when_layout_change", true);
pref("dom.event.pointer.rawupdate.enabled", true);
pref("dom.w3c_pointer_events.dispatch_click_on_pointer_capturing_element", true);
pref("dom.w3c_pointer_events.dispatch_click_on_pointer_capturing_element.except_touch", true);
pref("extensions.htmlaboutaddons.local_model_management", true);
pref("gfx.webrender.debug.highlight-backdrop-filters", false);
pref("image.natural-size-fallback.enabled", false);
pref("javascript.options.atomics_wait_async", false);
pref("javascript.options.experimental.self_hosted_cache", false);
pref("javascript.options.ion.regalloc", 0);
pref("javascript.options.mem.nursery_max_time_goal_ms", 4);
pref("javascript.options.warn_asmjs_deprecation", true);
pref("javascript.options.wasm_trace_api", false);
pref("layout.css.android-pip.enabled", true);
pref("layout.css.light-dark.images.enabled", false);
pref("network.android_doh.autoselect_enabled", false);
pref("network.connectivity-service.wait_for_idle_startup", true);
pref("network.dns.always_ai_canonname", true);
pref("network.dns.native_https_timeout_mac", 5000);
pref("network.http.http3.ecn_mark", false);
pref("network.http.http3.ecn_report", true);
pref("network.sniff.use_extension", false);
pref("nimbus.profilesdatastoreservice.enabled", true);
pref("pdfjs.capCanvasAreaFactor", 200);
pref("remote.experimental-parent-navigation.enabled", false);
pref("urlclassifier.delay_prefixes_crc32_check", false);
pref("widget.gtk.clipboard_timeout_ms", 1000);
==REMOVED, RENAMED or HIDDEN
pref("browser.newtabpage.activity-stream.discoverystream.sections.personalization.inferred.blocked", false);
pref("browser.newtabpage.activity-stream.discoverystream.sections.personalization.inferred.position", "1");
pref("browser.newtabpage.activity-stream.newtabAdSize.variant-a", false);
pref("browser.newtabpage.activity-stream.newtabAdSize.variant-b", false);
pref("browser.newtabpage.activity-stream.newtabWallpapers.v2.enabled", true);
pref("browser.shopping.experience2023.active", true);
pref("browser.shopping.experience2023.ads.enabled", false);
pref("browser.shopping.experience2023.ads.userEnabled", true);
pref("browser.shopping.experience2023.autoOpen.enabled", false);
pref("browser.shopping.experience2023.autoOpen.userEnabled", true);
pref("browser.shopping.experience2023.integratedSidebar", false);
pref("browser.shopping.experience2023.newPositionCard.hasSeen", false);
pref("browser.shopping.experience2023.optedIn", 0);
pref("browser.shopping.experience2023.showKeepSidebarClosedMessage", true);
pref("browser.shopping.experience2023.sidebarClosedCount", 0);
pref("browser.shopping.experience2023.survey.enabled", true);
pref("browser.shopping.experience2023.survey.hasSeen", false);
pref("browser.shopping.experience2023.survey.pdpVisits", 0);
pref("browser.urlbar.suggest.pocket", true);
pref("devtools.debugger.features.codemirror-next", true);
pref("dom.element.customstateset.enabled", true);
pref("dom.element.dialog.toggle_events.enabled", true);
pref("dom.viewTransitions.live-capture", true);
pref("dom.webcomponents.shadowdom.declarative.enabled", true);
pref("extensions.screenshots.disabled", false);
pref("layout.css.light-dark.enabled", true);
pref("network.http.http3.ecn", false);
pref("security.mixed_content.block_object_subrequest", false);
pref("security.xfocsp.errorReporting.automatic", false);
pref("security.xfocsp.errorReporting.enabled", true);
pref("sidebar.newTool.migration.reviewchecker", "{\"visibilityPref\": \"browser.shopping.experience2023.integratedSidebar\"}");
pref("toolkit.shopping.environment", "prod");
pref("toolkit.shopping.experience2023.defr", false);
==CHANGED
pref("browser.ml.minimumPhysicalMemory", 3); // prev: 4
pref("browser.newtabpage.activity-stream.discoverystream.thumbsUpDown.region-thumbs-config", "US"); // prev: ""
pref("browser.newtabpage.activity-stream.newtabWallpapers.customColor.enabled", true); // prev: false
pref("browser.newtabpage.activity-stream.newtabWallpapers.customWallpaper.enabled", true); // prev: false
pref("browser.newtabpage.activity-stream.support.url", "https://support.mozilla.org/1/firefox/140.0/WINNT/en-US/new-tab"); // prev: "https://support.mozilla.org/1/firefox/139.0/WINNT/en-US/new-tab"
pref("browser.search.rustSelector.featureGate", true); // prev: false
pref("browser.tabs.fadeOutExplicitlyUnloadedTabs", true); // prev: false
pref("browser.tabs.unloadTabInContextMenu", true); // prev: false
pref("browser.urlbar.scotchBonnet.enableOverride", true); // prev: false
pref("dom.cookieStore.enabled", true); // prev: false
pref("dom.cookieStore.manager.enabled", true); // prev: false
pref("dom.customHighlightAPI.enabled", true); // prev: false
pref("dom.mutation_events.enabled", false); // prev: true
pref("dom.security.html_serialization_escape_lt_gt", true); // prev: false
pref("dom.timeout.defer_during_load.force-disable", "*.usps.com, *.nvidia.com, *.fedex.com, *.msci.com, *.the-saleroom.com"); // prev: "*.usps.com, *.nvidia.com, *.fedex.com, *.msci.com"
pref("extensions.dataCollectionPermissions.enabled", true); // prev: false
pref("extensions.ml.enabled", true); // prev: false
pref("extensions.pocket.enabled", false); // prev: true
pref("javascript.options.property_error_message_fix", true); // prev: false
pref("javascript.options.wasm_lazy_tiering", true); // prev: false
pref("layout.css.h1-in-section-ua-styles.enabled", false); // prev: true
pref("media.eme.mfcdm.origin-filter.enabled", 4); // prev: 1
pref("media.peerconnection.dtls.version.max", 772); // prev: 771
pref("network.cookie.chips.partitionLimitDryRun", true); // prev: false
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