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FF137 release date: Apr. 1st 2025
FF137 release notes
FF137 for developers
FF137 security advisories
133 diffs ( 73 new, 32 gone, 28 different )
removed, renamed or hidden in v137.0:
8001
pref("media.ondevicechange.enabled", true); 1882674 f377ade- FYI:
- pref("browser.contentblocking.features.strict" 1951443
was: "tp,tpPrivate,cookieBehavior5,cookieBehaviorPBM5,cm,fp,stp,emailTP,emailTPPrivate,lvl2,rp,rpTop,ocsp,qps,qpsPBM,fpp,fppPrivate,btp"); now: "tp,tpPrivate,cookieBehavior5,cookieBehaviorPBM5,cm,fp,stp,emailTP,emailTPPrivate,lvl2,rp,rpTop,ocsp,qps,qpsPBM,fpp,fppPrivate,3pcd,btp" diff: removed `3pcd`
changed in v137.0:
1224
pref("security.remote_settings.crlite_filters.enabled", true); // prev: false- FYI
- pref("security.pki.crlite_channel", "default"); // prev: "all" 1944097
ignore
click me for details
==NEW
pref("browser.contentanalysis.interception_point.clipboard.plain_text_only", true);
pref("browser.contentanalysis.interception_point.drag_and_drop.plain_text_only", true);
pref("browser.contentanalysis.timeout_result", 0);
pref("browser.contextual-password-manager.enabled", false);
pref("browser.crashReporter.memtest", true);
pref("browser.crashReporter.memtestKinds", "");
pref("browser.crashReports.crashPull", false);
pref("browser.crashReports.requestedNeverShowAgain", false);
pref("browser.newtabpage.activity-stream.caretBlinkCount", 5);
pref("browser.newtabpage.activity-stream.caretBlinkTime", 530);
pref("browser.newtabpage.activity-stream.discoverystream.publisherFavicon.enabled", false);
pref("browser.newtabpage.activity-stream.discoverystream.sections.interestPicker.enabled", false);
pref("browser.newtabpage.activity-stream.discoverystream.sections.interestPicker.visibleSections", "");
pref("browser.newtabpage.activity-stream.discoverystream.sections.personalization.inferred.enabled", false);
pref("browser.newtabpage.activity-stream.images.smart", true);
pref("browser.newtabpage.activity-stream.newtabWallpapers.customWallpaper.enabled", false);
pref("browser.newtabpage.activity-stream.newtabWallpapers.customWallpaper.uploadedPreviously", false);
pref("browser.preonboarding.onTrainRolloutPopulation", 0);
pref("browser.safebrowsing.only_top_level", false);
pref("browser.shopping.experience2023.autoClose.userEnabled", true);
pref("browser.shopping.experience2023.newPositionCard.hasSeen", false);
pref("browser.tabs.fadeOutUnloadedTabs", false);
pref("browser.tabs.groups.smart.enabled", false);
pref("browser.urlbar.quicksuggest.contextualOptIn.dismissedCount", 0);
pref("browser.urlbar.quicksuggest.contextualOptIn.firstReshowAfterPeriodDays", 7);
pref("browser.urlbar.quicksuggest.contextualOptIn.impressionCount", 0);
pref("browser.urlbar.quicksuggest.contextualOptIn.impressionDaysLimit", 5);
pref("browser.urlbar.quicksuggest.contextualOptIn.impressionLimit", 20);
pref("browser.urlbar.quicksuggest.contextualOptIn.secondReshowAfterPeriodDays", 14);
pref("browser.urlbar.quicksuggest.contextualOptIn.thirdReshowAfterPeriodDays", 60);
pref("browser.urlbar.quicksuggest.settingsUi", 0);
pref("dom.media.webcodecs.h265.enabled", false);
pref("dom.text_fragments.create_text_fragment.timeout_seconds", 5);
pref("dom.viewTransitions.remain-active", false);
pref("dom.w3c_pointer_events.dispatch_by_pointer_messages.touch", false);
pref("dom.webnotifications.disable_open_click_delay", 1000);
pref("gfx.webrender.debug.missing-snapshot-panic", false);
pref("gfx.webrender.debug.missing-snapshot-pink", false);
pref("javascript.options.experimental.atomics_pause", true);
pref("javascript.options.experimental.dictionary_teleporting", true);
pref("javascript.options.experimental.import_attributes", false);
pref("javascript.options.experimental.math_sumprecise", true);
pref("layout.css.style-queries.enabled", false);
pref("layout.scroll_fixed_content_into_view_visually", false);
pref("media.ffmpeg.encoder.cpu-used", 7);
pref("media.hevc.enabled", true);
pref("memory.lazypurge.reuse_grace_period", 500);
pref("network.essential_domains_fallback", false);
pref("network.http.http3.idle_timeout", 30);
pref("network.http.http3.sni-slicing", true);
pref("network.http.skip_alt_svc_validation_on_https_rr", true);
pref("network.trr.idle_timeout_for_http3_conn", 30);
pref("pdfjs.enableAltTextForEnglish", false);
pref("pdfjs.enableAutoLinking", true);
pref("pdfjs.enableSignatureEditor", false);
pref("places.frecency.pages.alternative.interactions.manyKeypresses", 50);
pref("places.frecency.pages.alternative.interactions.maxVisitGapSeconds", 120);
pref("places.frecency.pages.alternative.interactions.viewTimeIfManyKeypressesSeconds", 20);
pref("places.frecency.pages.alternative.interactions.viewTimeSeconds", 60);
pref("places.frecency.pages.alternative.maxDaysFromToday", 60);
pref("places.frecency.pages.alternative.veryHighWeight", 200);
pref("security.browser_xhtml_csp.report-only", true);
pref("security.sandbox.gmp.acg.enabled", true);
pref("sidebar.animation.expand-on-hover.duration-ms", 400);
pref("sidebar.expandOnHover", false);
pref("sidebar.new-sidebar.has-used", false);
pref("sidebar.old-sidebar.has-used", false);
pref("telemetry.fog.init_on_shutdown", true);
pref("toolkit.shopping.experience2023.defr", false);
pref("widget.windows.follow_shortcuts_on_file_open", 2);
pref("widget.windows.hidden-taskbar-hack.paint", false);
pref("widget.windows.hidden-taskbar-hack.size", false);
pref("widget.windows.mica.popups", false);
==REMOVED, RENAMED or HIDDEN
pref("browser.newtabpage.activity-stream.discoverystream.sections.topicSelection.enabled", false);
pref("browser.newtabpage.activity-stream.newtabLogo.aprilfools", false);
pref("browser.newtabpage.activity-stream.newtabWallpapers.wallpaper-dark", "");
pref("browser.newtabpage.activity-stream.newtabWallpapers.wallpaper-light", "");
pref("browser.tabs.groups.dragOverThresholdPercent", 20);
pref("browser.urlbar.quicksuggest.allowPositionInSuggestions", true);
pref("browser.urlbar.quicksuggest.contextualOptIn.sayHello", false);
pref("browser.urlbar.quicksuggest.contextualOptIn.topPosition", true);
pref("browser.urlbar.quicksuggest.hideSettingsUI", false);
pref("browser.urlbar.quicksuggest.shouldShowOnboardingDialog", false);
pref("browser.urlbar.quicksuggest.showOnboardingDialogAfterNRestarts", 0);
pref("devtools.netmonitor.features.search", true);
pref("dom.compression_streams.enabled", true);
pref("dom.security.setHTML.enabled", false);
pref("dom.serviceWorkers.disable_open_click_delay", 1000);
pref("javascript.options.array_grouping", true);
pref("javascript.options.arraybuffer_transfer", true);
pref("javascript.options.destructuring_fuse", true);
pref("javascript.options.experimental.arraybuffer_resizable", true);
pref("javascript.options.experimental.float16array", true);
pref("javascript.options.experimental.new_set_methods", true);
pref("javascript.options.experimental.regexp_escape", true);
pref("javascript.options.experimental.sharedarraybuffer_growable", true);
pref("javascript.options.weakrefs", true);
pref("javascript.options.well_formed_unicode_strings", true);
pref("media.wmf.hevc.enabled", 1);
pref("messaging-system.rsexperimentloader.enabled", true);
pref("network.trr.display_fallback_warning", false);
pref("network.trr.fallback_warning_heuristic_list", "canary");
pref("network.trr_ui.show_fallback_warning_option", false);
pref("widget.windows.old-scrollwheel-message-hack", false);
==CHANGED
pref("browser.cache.disk.metadata_memory_limit", 1024); // prev: 250
pref("browser.contentanalysis.agent_timeout", 300); // prev: 30
pref("browser.http.blank_page_with_error_response.enabled", false); // prev: true
pref("browser.newtabpage.activity-stream.default.sites", "https://www.wikipedia.org/,https://www.youtube.com/,https://www.reddit.com/,https://addons.mozilla.org"); // prev: "https://www.youtube.com/,https://www.facebook.com/,https://www.wikipedia.org/,https://www.reddit.com/,https://twitter.com/"
pref("browser.newtabpage.activity-stream.support.url", "https://support.mozilla.org/1/firefox/137.0/WINNT/en-US/new-tab"); // prev: "https://support.mozilla.org/1/firefox/136.0/WINNT/en-US/new-tab"
pref("browser.newtabpage.activity-stream.unifiedAds.spocs.enabled", true); // prev: false
pref("browser.newtabpage.activity-stream.unifiedAds.tiles.enabled", true); // prev: false
pref("browser.newtabpage.activity-stream.weather.temperatureUnits", "c"); // prev: "f"
pref("browser.tabs.dragdrop.moveOverThresholdPercent", 80); // prev: 70
pref("browser.tabs.groups.dragOverDelayMS", 240); // prev: 120
pref("browser.urlbar.suggest.calculator", true); // prev: false
pref("devtools.netmonitor.columnsData", "[{\"name\":\"override\",\"minWidth\":20,\"width\":2}, {\"name\":\"status\",\"minWidth\":30,\"width\":5}, {\"name\":\"method\",\"minWidth\":30,\"width\":5}, {\"name\":\"domain\",\"minWidth\":30,\"width\":10}, {\"name\":\"file\",\"minWidth\":30,\"width\":25}, {\"name\":\"url\",\"minWidth\":30,\"width\":25},{\"name\":\"initiator\",\"minWidth\":30,\"width\":10},{\"name\":\"type\",\"minWidth\":30,\"width\":5},{\"name\":\"transferred\",\"minWidth\":30,\"width\":10},{\"name\":\"contentSize\",\"minWidth\":30,\"width\":5},{\"name\":\"waterfall\",\"minWidth\":150,\"width\":15}]"); // prev: "[{\"name\":\"status\",\"minWidth\":30,\"width\":5}, {\"name\":\"method\",\"minWidth\":30,\"width\":5}, {\"name\":\"domain\",\"minWidth\":30,\"width\":10}, {\"name\":\"file\",\"minWidth\":30,\"width\":25}, {\"name\":\"url\",\"minWidth\":30,\"width\":25},{\"name\":\"initiator\",\"minWidth\":30,\"width\":10},{\"name\":\"type\",\"minWidth\":30,\"width\":5},{\"name\":\"transferred\",\"minWidth\":30,\"width\":10},{\"name\":\"contentSize\",\"minWidth\":30,\"width\":5},{\"name\":\"waterfall\",\"minWidth\":150,\"width\":15}]"
pref("devtools.netmonitor.visibleColumns", "[\"override\",\"status\",\"method\",\"domain\",\"file\",\"initiator\",\"type\",\"transferred\",\"contentSize\",\"waterfall\"]"); // prev: "[\"status\",\"method\",\"domain\",\"file\",\"initiator\",\"type\",\"transferred\",\"contentSize\",\"waterfall\"]"
pref("dom.cookieStore.enabled", false); // prev: true
pref("dom.fetchKeepalive.request_limit_per_origin", 256); // prev: 250
pref("dom.fetchKeepalive.total_request_limit", 2048); // prev: 500
pref("dom.security.https_only_fire_http_request_background_timer_ms", 2200); // prev: 1500
pref("dom.svg.pathSegment.enabled", true); // prev: false
pref("font.name-list.sans-serif.zh-TW", "Arial, Microsoft JhengHei, PMingLiU, MingLiU, MingLiU-ExtB"); // prev: "Arial, PMingLiU, MingLiU, MingLiU-ExtB, Microsoft JhengHei"
pref("layout.css.hyphenate-limit-chars.enabled", true); // prev: false
pref("media.eme.mfcdm.origin-filter.enabled", 2); // prev: 1
pref("media.peerconnection.dtls.version.max", 771); // prev: 772
pref("pdfjs.enableUpdatedAddImage", true); // prev: false
pref("security.sandbox.gmp.win32k-disable", true); // prev: false
pref("webextensions.storage.session.enforceQuota", true); // prev: false
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