# user-overrides.js -rw-r--r-- 23.1 KiB View raw 
                                                                                
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// Apz
pref("apz.overscroll.enabled", false);

// Browser
pref("browser.aboutwelcome.enabled", false);
pref("browser.cache.disk.enable", false);
pref("browser.device-migration.help-menu.hidden", true);
pref("browser.download.enable_spam_prevention", true);
pref("browser.fixup.alternate.enabled", false); // Bug #16783: Prevent .onion fixups
pref("browser.menu.share_url.allow", false, locked);
pref("browser.newtabpage.activity-stream.asrouter.providers.cfr", "null");
pref("browser.newtabpage.activity-stream.asrouter.providers.message-groups", "null");
pref("browser.newtabpage.activity-stream.asrouter.providers.messaging-experiments", "null");
pref("browser.newtabpage.activity-stream.asrouter.providers.snippets", "null");
pref("browser.newtabpage.activity-stream.asrouter.providers.whats-new-panel", "null");
pref("browser.newtabpage.activity-stream.asrouter.useRemoteL10n", false);
pref("browser.newtabpage.activity-stream.discoverystream.enabled", false);
pref("browser.privacySegmentation.createdShortcut", true);
pref("browser.privatebrowsing.preserveClipboard", false);
pref("browser.region.local-geocoding", false);
pref("browser.region.network.scan", false);
pref("browser.search.region", "US"); // Disable GeoIP search lookups (#16254)
pref("browser.search.suggest.enabled.private", false);
pref("browser.tabs.remote.separatePrivilegedMozillaWebContentProcess", false);
pref("browser.tabs.remote.separatedMozillaDomains", "");
pref("browser.urlbar.suggest.addons", false);

// Cookiebanners
pref("cookiebanners.service.mode", 0);
pref("cookiebanners.service.mode.privateBrowsing", 0);
pref("cookiebanners.ui.desktop.enabled", false);

// Dom
pref("dom.enable_event_timing", false);
pref("dom.postMessage.sharedArrayBuffer.withCOOP_COEP", false);
pref("dom.security.https_only_mode_pbm", true);
pref("dom.text-recognition.enabled", false);
pref("dom.vr.enabled", false); // Bug 21607: Disable WebVR for now
pref("dom.webmidi.enabled", false); //  Bug 41398: Disable Web MIDI API

// Extensions
pref("extensions.abuseReport.enabled", false);

// Intl
pref("intl.multilingual.downloadEnabled", false);
pref("intl.multilingual.liveReload", false);

// Media
pref("media.aboutwebrtc.hist.enabled", false);

// Network
pref("network.http.http2.allow-push", true, locked);
pref("network.http.http2.chunk-size", 16000, locked);
pref("network.http.http2.coalesce-hostnames", true, locked);
pref("network.http.http2.default-concurrent", 100, locked);
pref("network.http.http2.default-hpack-buffer", 65536, locked);
pref("network.http.http2.enable-hpack-dump", false, locked);
pref("network.http.http2.enabled", true, locked);
pref("network.http.http2.enabled.deps", true, locked);
pref("network.http.http2.enforce-tls-profile", true, locked);
pref("network.http.http2.persistent-settings", false, locked);
pref("network.http.http2.ping-threshold", 58, locked);
pref("network.http.http2.ping-timeout", 8, locked);
pref("network.http.http2.pull-allowance", 12582912, locked);
pref("network.http.http2.push-allowance", 131072, locked);
pref("network.http.http2.send-buffer-size", 0, locked);
pref("network.http.http2.timeout", 170, locked);
pref("network.http.http2.websockets", true, locked);
pref("network.http.referer.hideOnionSource", true);
pref("network.protocol-handler.external-default", false);
pref("network.protocol-handler.external.mailto", false);
pref("network.protocol-handler.external.news", false);
pref("network.protocol-handler.external.nntp", false);
pref("network.protocol-handler.external.snews", false);
pref("network.protocol-handler.warn-external.mailto", true);
pref("network.protocol-handler.warn-external.news", true);
pref("network.protocol-handler.warn-external.nntp", true);
pref("network.protocol-handler.warn-external.snews", true);
pref("network.trr.default_provider_uri", "");
pref("network.trr.exclude-etc-hosts", false);

// Permissions
pref("permissions.memory_only", true);

// Privacy
pref("privacy.query_stripping.enabled", true);
pref("privacy.query_stripping.enabled.pbmode", true);
pref("privacy.query_stripping.strip_on_share.enabled", true);

// Security
pref("security.nocertdb", true);
pref("security.ssl.enable_false_start", true);
pref("security.ssl3.dhe_rsa_aes_128_sha", false, locked);
pref("security.ssl3.dhe_rsa_aes_256_sha", false, locked);

// Services
pref("services.sync.engine.addons", true);
pref("services.sync.engine.addresses", false);
pref("services.sync.engine.bookmarks", true);
pref("services.sync.engine.creditcards", false);
pref("services.sync.engine.history", false);
pref("services.sync.engine.passwords", false);
pref("services.sync.engine.prefs", true);
pref("services.sync.engine.tabs", false);

// Signon
pref("signon.management.page.breach-alerts.enabled", false, locked);
pref("signon.recipes.remoteRecipes.enabled", false);

// Accessibility
user_pref("accessibility.typeaheadfind", false); // enable "Find As You Type"

// App
user_pref("app.feedback.baseURL", "");
user_pref("app.releaseNotesURL", "");
user_pref("app.support.baseURL", "");
user_pref("app.update.auto", true);
user_pref("app.update.lastUpdateTime.telemetry_modules_ping", 0);
user_pref("app.update.staging.enabled", false);
user_pref("app.update.url.details", "");
user_pref("app.update.url.manual", "");

// Beacon
user_pref("beacon.enabled", false);

// Browser
user_pref("browser.bookmarks.max_backups", 2);
user_pref("browser.cache.offline.enable", false);
user_pref("browser.chrome.site_icons", true);
user_pref("browser.contentblocking.cfr-milestone.enabled", false); // Disable celebrating milestone toast when certain numbers of trackers are blocked
user_pref("browser.contentblocking.database.enabled", false); // Disable send content blocking log to about:protections
user_pref("browser.contentblocking.report.cookie.url", "");
user_pref("browser.contentblocking.report.cryptominer.url", "");
user_pref("browser.contentblocking.report.endpoint_url", "");
user_pref("browser.contentblocking.report.fingerprinter.url", "");
user_pref("browser.contentblocking.report.hide_vpn_banner", true);
user_pref("browser.contentblocking.report.lockwise.enabled", false);
user_pref("browser.contentblocking.report.lockwise.how_it_works.url", "");
user_pref("browser.contentblocking.report.manage_devices.url", "");
user_pref("browser.contentblocking.report.monitor.enabled", false);
user_pref("browser.contentblocking.report.monitor.home_page_url", "");
user_pref("browser.contentblocking.report.monitor.how_it_works.url", "");
user_pref("browser.contentblocking.report.monitor.preferences_url", "");
user_pref("browser.contentblocking.report.monitor.sign_in_url", "");
user_pref("browser.contentblocking.report.monitor.url", "");
user_pref("browser.contentblocking.report.proxy.enabled", false);
user_pref("browser.contentblocking.report.proxy_extension.url", "");
user_pref("browser.contentblocking.report.show_mobile_app", false);
user_pref("browser.contentblocking.report.social.url", "");
user_pref("browser.contentblocking.report.tracker.url", "");
user_pref("browser.contentblocking.report.vpn.enabled", false);
user_pref("browser.contentblocking.reportBreakage.url", "");
user_pref("browser.crashReports.unsubmittedCheck.autoSubmit", false);
user_pref("browser.crashReports.unsubmittedCheck.enabled", false);
user_pref("browser.disableResetPrompt", true);
user_pref("browser.discovery.sites", "");
user_pref("browser.display.use_document_fonts", 0);
user_pref("browser.dom.window.dump.enabled", false);
user_pref("browser.download.autohideButton", true);
user_pref("browser.newtab.preload", false);
user_pref("browser.newtabpage.activity-stream.enabled", false);
user_pref("browser.newtabpage.activity-stream.feeds.section.topstories", false);
user_pref("browser.newtabpage.activity-stream.feeds.section.topstories.options", "{\"hidden\":true}");
user_pref("browser.newtabpage.activity-stream.feeds.snippets", false);
user_pref("browser.newtabpage.activity-stream.feeds.topsites", false);
user_pref("browser.newtabpage.activity-stream.section.highlights.includeBookmarks", false);
user_pref("browser.newtabpage.activity-stream.section.highlights.includeDownloads", false);
user_pref("browser.newtabpage.activity-stream.section.highlights.includePocket", false);
user_pref("browser.newtabpage.activity-stream.section.highlights.includeVisited", false);
user_pref("browser.newtabpage.activity-stream.showSearch", false);
user_pref("browser.newtabpage.directory.ping", "");
user_pref("browser.newtabpage.directory.source", "data:text/plain,{}");
user_pref("browser.newtabpage.enhanced", false);
user_pref("browser.newtabpage.introShown", true);
user_pref("browser.pagethumbnails.capturing_disabled", true); // Disable page thumbnail collection [HIDDEN PREF]
user_pref("browser.pocket.enabled", false);
user_pref("browser.preferences.moreFromMozilla", false); // Disable moreFromMozilla
user_pref("browser.promo.focus.enabled", false);
user_pref("browser.region.network.url", "");
user_pref("browser.region.update.enabled", false);
user_pref("browser.safebrowsing.allowOverride", false);
user_pref("browser.safebrowsing.appRepURL", "");
user_pref("browser.safebrowsing.blockedURIs.enabled", false);
user_pref("browser.safebrowsing.downloads.enabled", false);
user_pref("browser.safebrowsing.downloads.remote.block_dangerous", false);
user_pref("browser.safebrowsing.downloads.remote.block_dangerous_host", false);
user_pref("browser.safebrowsing.downloads.remote.block_potentially_unwanted", false);
user_pref("browser.safebrowsing.downloads.remote.block_uncommon", false);
user_pref("browser.safebrowsing.downloads.remote.url", "");
user_pref("browser.safebrowsing.enabled", false);
user_pref("browser.safebrowsing.malware.enabled", false);
user_pref("browser.safebrowsing.passwords.enabled", false);
user_pref("browser.safebrowsing.phishing.enabled", false);
user_pref("browser.safebrowsing.provider.google.advisory", "");
user_pref("browser.safebrowsing.provider.google.advisoryURL", "");
user_pref("browser.safebrowsing.provider.google.gethashURL", "");
user_pref("browser.safebrowsing.provider.google.reportMalwareMistakeURL", "");
user_pref("browser.safebrowsing.provider.google.reportPhishMistakeURL", "");
user_pref("browser.safebrowsing.provider.google.reportURL", "");
user_pref("browser.safebrowsing.provider.google.updateURL", "");
user_pref("browser.safebrowsing.provider.google4.advisoryURL", "");
user_pref("browser.safebrowsing.provider.google4.dataSharing.enabled", false);
user_pref("browser.safebrowsing.provider.google4.dataSharingURL", "");
user_pref("browser.safebrowsing.provider.google4.gethashURL", "");
user_pref("browser.safebrowsing.provider.google4.reportMalwareMistakeURL", "");
user_pref("browser.safebrowsing.provider.google4.reportPhishMistakeURL", "");
user_pref("browser.safebrowsing.provider.google4.reportURL", "");
user_pref("browser.safebrowsing.provider.google4.updateURL", "");
user_pref("browser.safebrowsing.provider.mozilla.gethashURL", "");
user_pref("browser.safebrowsing.provider.mozilla.updateURL", "");
user_pref("browser.safebrowsing.reportPhishURL", "");
user_pref("browser.search.update", false);
user_pref("browser.send_pings", false);
user_pref("browser.shell.checkDefaultBrowser", false); // Disable default browser check
user_pref("browser.tabs.firefox-view", false); // Firefox-view
user_pref("browser.tabs.tabmanager.enabled", false) // Tab Manager
user_pref("browser.tabs.warnOnClose", true);
user_pref("browser.tabs.warnOnCloseOtherTabs", false);
user_pref("browser.tabs.warnOnOpen", false);
user_pref("browser.topsites.contile.enabled", false);
user_pref("browser.topsites.useRemoteSetting", false);
user_pref("browser.translation.engine", "");
user_pref("browser.uitour.url", ""); // Defense-in-depth
user_pref("browser.urlbar.autoFill", false);
user_pref("browser.urlbar.filter.javascript", true);
user_pref("browser.urlbar.groupLabels.enabled", false);
user_pref("browser.urlbar.quicksuggest.enabled", false);
user_pref("browser.urlbar.suggest.bookmark", true);
user_pref("browser.urlbar.suggest.engines", false);
user_pref("browser.urlbar.suggest.history", true);
user_pref("browser.urlbar.suggest.openpage", true);
user_pref("browser.urlbar.suggest.topsites", false);
user_pref("browser.urlbar.suggest.weather", false);
user_pref("browser.urlbar.trimURLs", false);
user_pref("browser.vpn_promo.enabled", false);
user_pref("browser.warnOnQuit", true);
user_pref("browser.warnOnQuitShortcut", true);

// Canvas
user_pref("canvas.capturestream.enabled", false);

// Clipboard
user_pref("clipboard.autocopy", false); // disable autocopy default [LINUX]

// Datareporting
user_pref("datareporting.healthreport.service.enabled", false);

// Default-browser-agent
user_pref("default-browser-agent.enabled", false); // [WINDOWS]

// Device
user_pref("device.sensors.ambientLight.enabled", false);
user_pref("device.sensors.enabled", false);
user_pref("device.sensors.motion.enabled", false);
user_pref("device.sensors.orientation.enabled", false);
user_pref("device.sensors.proximity.enabled", false);

// Devtools
user_pref("devtools.console.stdout.chrome", false);
user_pref("devtools.selfxss.count", 0);

// Dom
user_pref("dom.battery.enabled", false);
user_pref("dom.gamepad.enabled", false);
user_pref("dom.ipc.plugins.flash.subprocess.crashreporter.enabled", false);
user_pref("dom.ipc.plugins.reportCrashURL", false);
user_pref("dom.netinfo.enabled", false);
user_pref("dom.payments.defaults.saveAddress", false);
user_pref("dom.payments.defaults.saveCreditCard", false);
user_pref("dom.push.connection.enabled", false);
user_pref("dom.push.enabled", false);
user_pref("dom.push.serverURL", "");
user_pref("dom.push.userAgentID", "");
user_pref("dom.textMetrics.actualBoundingBox.enabled", false);
user_pref("dom.textMetrics.baselines.enabled", false);
user_pref("dom.textMetrics.emHeight.enabled", false);
user_pref("dom.textMetrics.fontBoundingBox.enabled", false);
user_pref("dom.vibrator.enabled", false);
user_pref("dom.w3c_touch_events.enabled", 0);
user_pref("dom.webnotifications.enabled", false); // Disable web notifications

// Experiments
user_pref("experiments.activeExperiment", false);
user_pref("experiments.enabled", false);
user_pref("experiments.manifest.uri", "");
user_pref("experiments.supported", false);

// Extensions
user_pref("extensions.FirefoxMulti-AccountContainers@mozilla.whiteList", "");
user_pref("extensions.blocklist.addonItemURL", "");
user_pref("extensions.blocklist.detailsURL", "");
user_pref("extensions.blocklist.enabled", false); // [DEFAULT: true]
user_pref("extensions.blocklist.itemURL", "");
user_pref("extensions.formautofill.addresses.enabled", false);
user_pref("extensions.formautofill.creditCards.enabled", false);
user_pref("extensions.getAddons.cache.enabled", false);
user_pref("extensions.greasemonkey.stats.optedin", false);
user_pref("extensions.greasemonkey.stats.url", "");
user_pref("extensions.pocket.enabled", false); // Disable Pocket
user_pref("extensions.screenshots.disabled", true);
user_pref("extensions.update.autoUpdateDefault", true);
user_pref("extensions.update.enabled", true);
user_pref("extensions.webcompat-reporter.newIssueEndpoint", "");
user_pref("extensions.webservice.discoverURL", "");

// Fission
user_pref("fission.autostart", true);

// Full-screen-api
user_pref("full-screen-api.warning.delay", 0);
user_pref("full-screen-api.warning.timeout", 0);

// Gecko
user_pref("gecko.handlerService.schemes.irc.0.name", "");
user_pref("gecko.handlerService.schemes.irc.0.uriTemplate", "");
user_pref("gecko.handlerService.schemes.ircs.0.name", "");
user_pref("gecko.handlerService.schemes.ircs.0.uriTemplate", "");
user_pref("gecko.handlerService.schemes.mailto.0.name", "");
user_pref("gecko.handlerService.schemes.mailto.0.uriTemplate", "");
user_pref("gecko.handlerService.schemes.mailto.1.name", "");
user_pref("gecko.handlerService.schemes.mailto.1.uriTemplate", "");

// Geo
user_pref("geo.enabled", false);
user_pref("geo.provider.geoclue.always_high_accuracy", false); // [LINUX]
user_pref("geo.provider.network.url", "");

// Gfx
user_pref("gfx.font_rendering.graphite.enabled", false);
user_pref("gfx.font_rendering.opentype_svg.enabled", false);
user_pref("gfx.offscreencanvas.enabled", false);
user_pref("gfx.webrender.all", true);

// Identity
user_pref("identity.fxaccounts.account.telemetry.sanitized_uid", "");

// Intl
user_pref("intl.accept_languages", "en-US, en");

// Javascript
user_pref("javascript.options.asmjs", false);
user_pref("javascript.options.baselinejit", false);
user_pref("javascript.options.ion", false);
user_pref("javascript.options.jit_trustedprincipals", true); // [FF75+] [HIDDEN PREF]

// Keyword
user_pref("keyword.enabled", true);

// Layout
user_pref("layout.css.visited_links_enabled", false);
user_pref("layout.frame_rate", 120); // 120 FPS
user_pref("layout.spellcheckDefault", 0); // 0=none, 1-multi-line, 2=multi-line & single-line

// Lightweightthemes
user_pref("lightweightThemes.getMoreURL", "");

// Mathml
user_pref("mathml.disabled", true);

// Media
user_pref("media.autoplay.default", 1);
user_pref("media.autoplay.enabled", false);
user_pref("media.gmp-gmpopenh264.enabled", true);
user_pref("media.gmp-manager.url", "data:text/plain,");
user_pref("media.navigator.enabled", false);
user_pref("media.video_stats.enabled", false);
user_pref("media.webspeech.synth.enabled", false);
user_pref("media.webvtt.debug.logging", false);
user_pref("media.webvtt.testing.events", false);

// Network
user_pref("network.allow-experiments", false);
user_pref("network.dns.blockDotOnion", true);
user_pref("network.dns.disableIPv6", false);
user_pref("network.dns.disablePrefetchFromHTTPS", true);
user_pref("network.manage-offline-status", false);
user_pref("network.protocol-handler.expose-all", false);
user_pref("network.protocol-handler.expose.about", true);
user_pref("network.protocol-handler.expose.blob", true);
user_pref("network.protocol-handler.expose.chrome", true);
user_pref("network.protocol-handler.expose.data", true);
user_pref("network.protocol-handler.expose.file", true);
user_pref("network.protocol-handler.expose.ftp", true);
user_pref("network.protocol-handler.expose.http", true);
user_pref("network.protocol-handler.expose.https", true);
user_pref("network.protocol-handler.expose.javascript", true);
user_pref("network.protocol-handler.expose.moz-extension", true);
user_pref("network.protocol-handler.external.about", false);
user_pref("network.protocol-handler.external.blob", false);
user_pref("network.protocol-handler.external.chrome", false);
user_pref("network.protocol-handler.external.data", false);
user_pref("network.protocol-handler.external.file", false);
user_pref("network.protocol-handler.external.ftp", false);
user_pref("network.protocol-handler.external.http", false);
user_pref("network.protocol-handler.external.https", false);
user_pref("network.protocol-handler.external.javascript", false);
user_pref("network.protocol-handler.external.moz-extension", false);
user_pref("network.protocol-handler.warn-external-default", true);
user_pref("network.trr.confirmationNS", "skip");
user_pref("network.trr.mode", 3);
user_pref("network.trr.uri", "https://base.dns.mullvad.net/dns-query");

// Permissions
user_pref("permissions.default.desktop-notification", 2);
user_pref("permissions.default.geo", 2);
user_pref("permissions.default.xr", 2); // Virtual Reality

// Privacy
user_pref("privacy.clearOnShutdown.openWindows", true);
user_pref("privacy.cpd.offlineApps", true); // [DEFAULT: false]
user_pref("privacy.cpd.openWindows", true); // Session Restore
user_pref("privacy.donottrackheader.enabled", false);
user_pref("privacy.globalprivacycontrol.enabled", false);
user_pref("privacy.history.custom", true);
user_pref("privacy.query_stripping", true);
user_pref("privacy.query_stripping.strip_list", "__hsfp __hssc __hstc __s _hsenc _openstat dclid fbclid gbraid gclid hsCtaTracking igshid mc_eid ml_subscriber ml_subscriber_hash msclkid oft_c oft_ck oft_d oft_id oft_ids oft_k oft_lk oft_sk oly_anon_id oly_enc_id rb_clickid s_cid twclid vero_conv vero_id wbraid wickedid yclid");
user_pref("privacy.resistFingerprinting", false); // Disable resist Fingerprinting
user_pref("privacy.resistFingerprinting.autoDeclineNoUserInputCanvasPrompts", true);
user_pref("privacy.resistFingerprinting.letterboxing", false); // Disable letter boxing
user_pref("privacy.trackingprotection.cryptomining.enabled", true);
user_pref("privacy.trackingprotection.enabled", true);
user_pref("privacy.trackingprotection.fingerprinting.enabled", false);
user_pref("privacy.trackingprotection.pbmode.enabled", true);
user_pref("privacy.trackingprotection.socialtracking.enabled", true);

// Security
user_pref("security.certerrors.mitm.priming.enabled", false);
user_pref("security.certerrors.mitm.priming.endpoint", "");
user_pref("security.family_safety.mode", 0);
user_pref("security.pki.mitm_canary_issuer", "");
user_pref("security.pki.mitm_canary_issuer.enabled", false);
user_pref("security.pki.mitm_detected", false);
user_pref("security.protectionspopup.recordEventTelemetry", false);
user_pref("security.remote_settings.crlite_filters.bucket", "");
user_pref("security.remote_settings.crlite_filters.collection", "");
user_pref("security.remote_settings.crlite_filters.signer", "");
user_pref("security.remote_settings.intermediates.bucket", "");
user_pref("security.remote_settings.intermediates.collection", "");
user_pref("security.remote_settings.intermediates.enabled", false);
user_pref("security.remote_settings.intermediates.signer", "");
user_pref("security.sandbox.gpu.level", 1);
user_pref("security.ssl.enable_ocsp_stapling", false);
user_pref("security.ssl.errorReporting.automatic", false);

// Services
user_pref("services.blocklist.addons.collection", "");
user_pref("services.blocklist.addons.signer", "");
user_pref("services.blocklist.gfx.collection", "");
user_pref("services.blocklist.gfx.signer", "");
user_pref("services.blocklist.plugins.collection", "");
user_pref("services.blocklist.plugins.signer", "");
user_pref("services.blocklist.update_enabled", true);
user_pref("services.settings.server", "");
user_pref("services.sync.prefs.sync.browser.newtabpage.activity-stream.showSponsoredTopSite", false);

// Signon
user_pref("signon.generation.enabled", false);

user_pref("signon.management.page.breachAlertUrl", "");
user_pref("signon.rememberSignons", false); // Disable saving passwords

// Startup
user_pref("startup.homepage_override_url", "");
user_pref("startup.homepage_welcome_url", "");
user_pref("startup.homepage_welcome_url.additional", "");

// Toolkit
user_pref("toolkit.coverage.enabled", false);
user_pref("toolkit.crashreporter.infoURL", "");
user_pref("toolkit.legacyUserProfileCustomizations.stylesheets", true);
user_pref("toolkit.telemetry.cachedClientID", "");
user_pref("toolkit.telemetry.hybridContent.enabled", false);
user_pref("toolkit.telemetry.previousBuildID", "");
user_pref("toolkit.telemetry.prompted", 2);
user_pref("toolkit.telemetry.rejected", true);
user_pref("toolkit.telemetry.reportingpolicy.firstRun", false);
user_pref("toolkit.telemetry.server", "");
user_pref("toolkit.telemetry.server_owner", "");
user_pref("toolkit.telemetry.unifiedIsOptIn", false);

// Webgl
user_pref("webgl.disabled", false); // 4520 [mostly pointless if not using RFP]
user_pref("webgl.enable-debug-renderer-info", false);
user_pref("webgl.enable-webgl2", false);
user_pref("webgl.renderer-string-override", "");
user_pref("webgl.vendor-string-override", "");

// Xpinstall
user_pref("xpinstall.signatures.required", false);

pref("privacy.spoof_english", 2);
pref("doh-rollout.disable-heuristics", true);