ToDo: diffs FF145-FF146

FF146 [release date](https://whattrainisitnow.com/calendar/): Dec. 9th 2025 [FF146 release notes](https://www.mozilla.org/firefox/146.0/releasenotes/) [FF146 for developers](https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/146) [FF146 security advisories](https://www.mozilla.org/security/advisories/mfsa2025-92/) --- 105 diffs (41 new, 39 gone, 25 different) ### new in 146.0: ```js pref("browser.backup.tab-flush-timeout", 5000); pref("browser.ipProtection.added", false); pref("browser.ipProtection.autoStartEnabled", false); pref("browser.ipProtection.autoStartPrivateEnabled", false); pref("browser.ipProtection.domainInclusions", ""); pref("browser.ipProtection.features.autoStart", false); pref("browser.ipProtection.features.siteExceptions", false); pref("browser.ipProtection.panelOpenCount", 0); pref("browser.ml.linkPreview.supportedLocales", "en"); pref("browser.newtabpage.activity-stream.discoverystream.attribution.enabled", false); pref("browser.newtabpage.activity-stream.feeds.newtabattributionfeed", true); pref("browser.search.widget.new", false); pref("browser.tabs.dragDrop.multiselectStacking", false); pref("browser.tabs.notes.enabled", false); pref("browser.tabs.splitView.enabled", false); pref("browser.theme.forced-colors-override.enabled", true); pref("browser.urlbar.flightStatus.featureGate", false); pref("browser.urlbar.quicksuggest.online.available", false); pref("browser.urlbar.sports.featureGate", false); pref("browser.urlbar.suggest.quicksuggest.all", false); pref("browser.urlbar.suggest.sports", true); pref("devtools.selfxss.count", 0); pref("devtools.toolbox.selectedTool", "inspector"); pref("dom.input.showPicker_datalist.enabled", false); pref("gfx.canvas.accelerated.max-snapshot-pbo-memory", 67108864); pref("gfx.webrender.debug.external-composite-borders", false); pref("layers.gpu-process.launch-in-background", true); pref("layout.css.contrast-color.enabled", true); pref("layout.css.custom-media.enabled", false); pref("layout.css.text-decoration-inset.enabled", true); pref("network.cache.purge_disable", false); pref("network.cache.suspended_writer_delay_ms", 5000); pref("network.lna.benchmarking-is-local", false); pref("network.lna.etp.enabled", false); pref("network.lna.local-network-to-localhost.skip-checks", true); pref("network.lna.skip-domains", ""); pref("network.lna.websocket.enabled", false); pref("security.qwacs.enable_test_trust_anchors", false); pref("security.restrict_to_adults.always", false); pref("security.restrict_to_adults.respect_platform", false); pref("termsofuse.firstAcceptedDate", 0); ``` ### removed, renamed or hidden in 146.0: ```js pref("browser.menu.showCharacterEncoding", false); pref("browser.newtabpage.activity-stream.discoverystream.contextualContent.enabled", false); pref("browser.newtabpage.activity-stream.discoverystream.contextualContent.fakespot.ctaCopy", ""); pref("browser.newtabpage.activity-stream.discoverystream.contextualContent.fakespot.ctaUrl", ""); pref("browser.newtabpage.activity-stream.discoverystream.contextualContent.fakespot.defaultCategoryTitle", ""); pref("browser.newtabpage.activity-stream.discoverystream.contextualContent.fakespot.enabled", true); pref("browser.newtabpage.activity-stream.discoverystream.contextualContent.fakespot.footerCopy", ""); pref("browser.newtabpage.activity-stream.discoverystream.contextualContent.feeds", "need_to_know, fakespot"); pref("browser.newtabpage.activity-stream.discoverystream.contextualContent.listFeedTitle", ""); pref("browser.newtabpage.activity-stream.discoverystream.contextualContent.locale-content-config", "en-US,en-GB,en-CA,de"); pref("browser.newtabpage.activity-stream.discoverystream.contextualContent.region-content-config", ""); pref("browser.newtabpage.activity-stream.discoverystream.contextualContent.selectedFeed", "need_to_know"); pref("browser.newtabpage.activity-stream.system.showSponsoredCheckboxes", true); pref("browser.preferences.experimental", true); pref("browser.urlbar.update2.engineAliasRefresh", true); pref("devtools.inspector.inactive.css.enabled", true); pref("dom.events.script_execute.enabled", false); pref("dom.workers.importScripts.enforceStrictMimeType", true); pref("font.language.group", "x-western"); pref("font.size.inflation.disabledInMasterProcess", false); pref("gfx.canvas.remote", false); pref("gfx.canvas.remote.allow-in-parent", false); pref("gfx.canvas.remote.worker-threads", 0); pref("gfx.direct2d.disabled", true); pref("gfx.direct2d.force-enabled", false); pref("gfx.direct2d.target-independent-rasterization.disabled", false); pref("intl.ellipsis", "…"); pref("intl.menuitems.alwaysappendaccesskeys", ""); pref("intl.menuitems.insertseparatorbeforeaccesskeys", true); pref("javascript.options.experimental.json_parse_with_source", true); pref("javascript.options.experimental.regexp_duplicate_named_groups", true); pref("javascript.options.experimental.regexp_modifiers", true); pref("layers.gpu-process.allow-software", true); pref("layout.css.text-decoration-trim.enabled", false); pref("mathml.centered_operators.disabled", true); pref("mathml.top_bottom_spacing_for_stretchy_operators.disabled", true); pref("mathml.unknown_mrow.enabled", true); pref("privacy.query_stripping.strip_on_share.canDisable", true); pref("services.sync.prefs.sync.browser.discovery.enabled", true); ``` ### changed in 146.0: ```js pref("browser.contentblocking.features.strict", "tp,tpPrivate,cookieBehavior5,cookieBehaviorPBM5,cryptoTP,fp,stp,emailTP,emailTPPrivate,-consentmanagerSkip,-consentmanagerSkipPrivate,lvl2,rp,rpTop,ocsp,qps,qpsPBM,fpp,fppPrivate,btp,lna"); // tp,tpPrivate,cookieBehavior5,cookieBehaviorPBM5,cryptoTP,fp,stp,emailTP,emailTPPrivate,-consentmanagerSkip,-consentmanagerSkipPrivate,lvl2,rp,rpTop,ocsp,qps,qpsPBM,fpp,fppPrivate,btp pref("browser.migrate.ie.enabled", false); // true pref("browser.ml.linkPreview.enabled", true); // false pref("browser.ml.linkPreview.noKeyPointsRegions", ""); // AD,AT,BE,BG,CH,CY,CZ,DE,DK,EE,ES,FI,FR,GR,HR,HU,IE,IS,IT,LI,LT,LU,LV,MT,NL,NO,PL,PT,RO,SE,SI,SK pref("browser.newtabpage.activity-stream.discoverystream.sections.region-content-config", "US"); // pref("browser.newtabpage.activity-stream.support.url", "https://support.mozilla.org/1/firefox/146.0/Linux/en-US/new-tab"); // https://support.mozilla.org/1/firefox/145.0/Linux/en-US/new-tab pref("browser.newtabpage.activity-stream.weather.optInDisplayed", true); // false pref("browser.newtabpage.activity-stream.weather.staticData.enabled", true); // false pref("browser.safebrowsing.provider.google5.lists", "goog-badbinurl-proto,goog-downloadwhite-proto,goog-phish-proto,googpub-phish-proto,goog-malware-proto,goog-unwanted-proto,goog-harmful-proto"); // goog-phish-proto,googpub-phish-proto,goog-malware-proto,goog-unwanted-proto,goog-harmful-proto pref("browser.urlbar.quicksuggest.settingsUi", 1); // 0 pref("gfx.webrender.precise-conic-gradients", true); // false pref("gfx.webrender.precise-radial-gradients-swgl", false); // true pref("intl.accept_languages", "und"); // en-US, en pref("javascript.options.experimental.symbols_as_weakmap_keys", true); // false pref("javascript.options.wasm_relaxed_simd", true); // false pref("layers.gpu-process.startup_timeout_ms", 10000); // 5000 pref("layout.css.at-scope.enabled", true); // false pref("layout.css.webkit-fill-available.enabled", true); // false pref("mathml.math_shift.enabled", true); // false pref("mathml.rtl_operator_mirroring.enabled", true); // false pref("media.devices.enumerate.legacy.allowlist", "slack.com,*.slack.com,riverside.fm,*.riverside.fm"); // slack.com,*.slack.com pref("media.peerconnection.sctp.use_dcsctp", true); // false pref("media.webrtc.send_mlkem_keyshare", true); // false pref("network.dns.resolver_shutdown_timeout_ms", 5000); // 2000 pref("widget.wayland.fractional-scale.enabled", true); // false ``` --- ### ignore <details><summary>click me for details</summary><p> ==NEW ```js ``` ==REMOVED, RENAMED or HIDDEN ```js ``` ==CHANGED ```js ``` </p></details>