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FF138 release date: Apr. 29th 2025
FF138 release notes
FF138 for developers
FF138 security advisories
95 diffs ( 56 new, 17 gone, 22 different )
new in v138.0:
- FYI
- pref("dom.storage_access.auto_grants.exclude_third_party_trackers", false); 1943536
- META 1918324
3ptcbd
coming to a store near you soon - currently true in nightly 141
- META 1918324
- pref("dom.serviceWorkers.privateBrowsing.enabled", false); - we get this in FF/ESR140+ yay! π
- pref("media.navigator.mozgetusermedia.enabled", true); 1609254
- pref("dom.storage_access.auto_grants.exclude_third_party_trackers", false); 1943536
changed in v138.0:
0806
pref("browser.urlbar.weather.featureGate", true); // prev: false 1961069 001ca0c- FYI: sounds good to me
- pref("privacy.clearSiteDataHeader.cache.enabled", true); // prev: false 1930500
ignore
click me for details
==NEW
pref("browser.contentanalysis.max_connections", 32);
pref("browser.ml.linkPreview.allowedLanguages", "en");
pref("browser.ml.linkPreview.blockListEnabled", true);
pref("browser.ml.linkPreview.enabled", false);
pref("browser.ml.linkPreview.outputSentences", 3);
pref("browser.ml.overridePipelineOptions", "{}");
pref("browser.newtabpage.activity-stream.discoverystream.reportContent.enabled", false);
pref("browser.newtabpage.activity-stream.discoverystream.sections.personalization.inferred.user.enabled", true);
pref("browser.newtabpage.activity-stream.feeds.newtabmessaging", true);
pref("browser.newtabpage.activity-stream.newtabAdSize.mediumRectangle", false);
pref("browser.newtabpage.activity-stream.newtabWallpapers.customWallpaper.fileSize", 0);
pref("browser.newtabpage.activity-stream.newtabWallpapers.customWallpaper.fileSize.enabled", false);
pref("browser.newtabpage.activity-stream.newtabWallpapers.customWallpaper.uuid", "");
pref("browser.search.rustSelector.featureGate", false);
pref("browser.tabs.dragDrop.createGroup.delayMS", 240);
pref("browser.tabs.dragDrop.expandGroup.delayMS", 350);
pref("browser.tabs.dragDrop.moveOverThresholdPercent", 80);
pref("browser.tabs.dragDrop.selectTab.delayMS", 350);
pref("browser.tabs.fadeOutExplicitlyUnloadedTabs", false);
pref("browser.tabs.groups.smart.optin", false);
pref("browser.tabs.groups.smart.userEnabled", true);
pref("devtools.performance.aboutprofiling.has-developer-options", false);
pref("dom.compression_streams.zstd.enabled", false);
pref("dom.cookieStore.manager.enabled", false);
pref("dom.document.name_getter_follow_spec.enabled", true);
pref("dom.origin_agent_cluster.default", false);
pref("dom.origin_agent_cluster.enabled", true);
pref("dom.performance.event_timing.enable_interactionid", false);
pref("dom.quotaManager.groupInitialization.pauseOnIOThreadMs", 0);
pref("dom.selection.mimic_chrome_tostring.enabled", false);
pref("dom.timeout.defer_during_load.force-disable", "*.usps.com, *.nvidia.com, *.fedex.com, *.msci.com");
pref("dom.viewTransitions.live-capture", true);
pref("dom.viewTransitions.wr-old-capture", true);
pref("dom.webnotifications.actions.enabled", false);
pref("extensions.formautofill.heuristics.detectDynamicFormChanges", true);
pref("extensions.formautofill.heuristics.fillOnDynamicFormChanges", true);
pref("extensions.formautofill.heuristics.fillOnDynamicFormChanges.timeout", 1000);
pref("gfx.webrender.layer-compositor-use-composition-surface", true);
pref("javascript.options.experimental.error_iserror", true);
pref("layout.css.details-content.enabled", false);
pref("network.xhr.block_sync_system_requests", true);
pref("pdfjs.viewerCssTheme", 0);
pref("privacy.trackingprotection.consentmanager.annotate_channels", true);
pref("privacy.trackingprotection.consentmanager.skip.enabled", false);
pref("privacy.trackingprotection.consentmanager.skip.pbmode.enabled", true);
pref("security.client_auth_certificate_default_remember_setting", 2);
pref("sidebar.newTool.migration.reviewchecker", "{\"visibilityPref\": \"browser.shopping.experience2023.integratedSidebar\"}");
pref("sidebar.revamp.defaultLauncherVisible", true);
pref("test.currentTimeOffsetSeconds", 0);
pref("urlclassifier.features.consentmanager.annotate.allowlistTables", "mozstd-trackwhite-digest256");
pref("urlclassifier.features.consentmanager.annotate.blocklistTables", "consent-manager-track-digest256");
pref("widget.windows.fullscreen_marking_method", 0);
pref("widget.windows.mica.toplevel-backdrop", 0);
==REMOVED, RENAMED or HIDDEN
pref("alerts.showFavicons", false);
pref("browser.ml.defaultModelMemoryUsage", 1);
pref("browser.ml.maximumMemoryPressure", 80);
pref("browser.ml.queueWaitInterval", 1);
pref("browser.ml.queueWaitTimeout", 60);
pref("browser.shopping.experience2023.autoClose.userEnabled", true);
pref("browser.shopping.experience2023.shoppingSidebar", true);
pref("browser.tabs.dragdrop.moveOverThresholdPercent", 80);
pref("browser.tabs.groups.dragOverDelayMS", 240);
pref("browser.uitour.requireSecure", true);
pref("dom.events.mouse-pointer-boundary.keep-enter-targets-after-over-target-removed", true);
pref("dom.popup.experimental", true);
pref("gfx.canvas.willreadfrequently.enabled", false);
pref("privacy.imageInputTelemetry.enableTestMode", false);
pref("security.remember_cert_checkbox_default_setting", true);
pref("toolkit.crashreporter.infoURL", "https://www.mozilla.org/legal/privacy/firefox.html#crash-reporter");
pref("webextensions.tests", false);
==CHANGED
pref("accessibility.uia.enable", 0); // prev: false
pref("app.update.multiSessionInstallLockout.enabled", false); // prev: true
pref("browser.ml.checkForMemory", true); // prev: false
pref("browser.ml.enable", true); // prev: false
pref("browser.newtabpage.activity-stream.support.url", "https://support.mozilla.org/1/firefox/138.0/WINNT/en-US/new-tab"); // prev: "https://support.mozilla.org/1/firefox/137.0/WINNT/en-US/new-tab"
pref("browser.safebrowsing.only_top_level", true); // prev: false
pref("browser.safebrowsing.provider.mozilla.lists", "base-track-digest256,mozstd-trackwhite-digest256,google-trackwhite-digest256,content-track-digest256,mozplugin-block-digest256,mozplugin2-block-digest256,ads-track-digest256,social-track-digest256,analytics-track-digest256,base-fingerprinting-track-digest256,content-fingerprinting-track-digest256,base-cryptomining-track-digest256,content-cryptomining-track-digest256,fanboyannoyance-ads-digest256,fanboysocial-ads-digest256,easylist-ads-digest256,easyprivacy-ads-digest256,adguard-ads-digest256,social-tracking-protection-digest256,social-tracking-protection-facebook-digest256,social-tracking-protection-linkedin-digest256,social-tracking-protection-twitter-digest256,base-email-track-digest256,content-email-track-digest256,consent-manager-track-digest256"); // prev: "base-track-digest256,mozstd-trackwhite-digest256,google-trackwhite-digest256,content-track-digest256,mozplugin-block-digest256,mozplugin2-block-digest256,ads-track-digest256,social-track-digest256,analytics-track-digest256,base-fingerprinting-track-digest256,content-fingerprinting-track-digest256,base-cryptomining-track-digest256,content-cryptomining-track-digest256,fanboyannoyance-ads-digest256,fanboysocial-ads-digest256,easylist-ads-digest256,easyprivacy-ads-digest256,adguard-ads-digest256,social-tracking-protection-digest256,social-tracking-protection-facebook-digest256,social-tracking-protection-linkedin-digest256,social-tracking-protection-twitter-digest256,base-email-track-digest256,content-email-track-digest256"
pref("gfx.canvas.remote.use-draw-image-fast-path-d3d", true); // prev: false
pref("javascript.options.experimental.error_capture_stack_trace", true); // prev: false
pref("javascript.options.experimental.import_attributes", true); // prev: false
pref("media.eme.mfcdm.origin-filter.enabled", 1); // prev: 2
pref("media.navigator.video.disable_h264_baseline", false); // prev: true
pref("network.dnsCacheEntries", 800); // prev: 400
pref("pdfjs.enableSignatureEditor", true); // prev: false
pref("security.browser_xhtml_csp.report-only", false); // prev: true
pref("sidebar.expandOnHover", true); // prev: false
pref("sidebar.main.tools", ""); // prev: "aichat,syncedtabs,history"
pref("urlclassifier.disallow_completions", "goog-downloadwhite-digest256,base-track-digest256,mozstd-trackwhite-digest256,content-track-digest256,mozplugin-block-digest256,mozplugin2-block-digest256,ads-track-digest256,social-track-digest256,analytics-track-digest256,base-fingerprinting-track-digest256,content-fingerprinting-track-digest256,base-cryptomining-track-digest256,content-cryptomining-track-digest256,fanboyannoyance-ads-digest256,fanboysocial-ads-digest256,easylist-ads-digest256,easyprivacy-ads-digest256,adguard-ads-digest256,social-tracking-protection-digest256,social-tracking-protection-facebook-digest256,social-tracking-protection-linkedin-digest256,social-tracking-protection-twitter-digest256,base-email-track-digest256,content-email-track-digest256,consent-manager-track-digest256"); // prev: "goog-downloadwhite-digest256,base-track-digest256,mozstd-trackwhite-digest256,content-track-digest256,mozplugin-block-digest256,mozplugin2-block-digest256,ads-track-digest256,social-track-digest256,analytics-track-digest256,base-fingerprinting-track-digest256,content-fingerprinting-track-digest256,base-cryptomining-track-digest256,content-cryptomining-track-digest256,fanboyannoyance-ads-digest256,fanboysocial-ads-digest256,easylist-ads-digest256,easyprivacy-ads-digest256,adguard-ads-digest256,social-tracking-protection-digest256,social-tracking-protection-facebook-digest256,social-tracking-protection-linkedin-digest256,social-tracking-protection-twitter-digest256,base-email-track-digest256,content-email-track-digest256"
pref("widget.windows.follow_shortcuts_on_file_open", 1); // prev: 2
pref("widget.windows.mica.popups", 2); // prev: false
Thorin-OakenpantsThorin-Oakenpants, sncix, icpantsparti2 and eleius