--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -244,7 +244,7 @@
 pref("browser.touchmode.auto", true);
 
 // At startup, check if we're the default browser and prompt user if not.
-pref("browser.shell.checkDefaultBrowser", true);
+pref("browser.shell.checkDefaultBrowser", false);
 pref("browser.shell.shortcutFavicons",true);
 pref("browser.shell.mostRecentDateSetAsDefault", "");
 pref("browser.shell.skipDefaultBrowserCheckOnFirstRun", true);
@@ -254,7 +254,7 @@
 
 // 0 = blank, 1 = home (browser.startup.homepage), 2 = last visited page, 3 = resume previous browser session
 // The behavior of option 3 is detailed at: http://wiki.mozilla.org/Session_Restore
-pref("browser.startup.page",                1);
+pref("browser.startup.page",                0);
 pref("browser.startup.homepage",            "chrome://branding/locale/browserconfig.properties");
 // Whether we should skip the homepage when opening the first-run page
 pref("browser.startup.firstrunSkipsHomepage", true);
@@ -318,7 +318,7 @@
 pref("browser.urlbar.suggest.bookmark",             true);
 pref("browser.urlbar.suggest.openpage",             true);
 pref("browser.urlbar.suggest.searches",             true);
-pref("browser.urlbar.userMadeSearchSuggestionsChoice", false);
+pref("browser.urlbar.userMadeSearchSuggestionsChoice", true);
 // The suggestion opt-in notification will be shown on 4 different days.
 pref("browser.urlbar.daysBeforeHidingSuggestionsPrompt", 4);
 pref("browser.urlbar.lastSuggestionsPromptDate", 20160601);
@@ -363,7 +363,7 @@
 pref("browser.download.animateNotifications", true);
 
 // This records whether or not the panel has been shown at least once.
-pref("browser.download.panel.shown", false);
+pref("browser.download.panel.shown", true);
 
 // This controls whether the button is automatically shown/hidden depending
 // on whether there are downloads to show.
@@ -415,7 +415,7 @@
 pref("browser.sessionhistory.max_entries", 50);
 
 // Built-in default permissions.
-pref("permissions.manager.defaultsUrl", "resource://app/defaults/permissions");
+pref("permissions.manager.defaultsUrl", "");
 
 // handle links targeting new windows
 // 1=current window/tab, 2=new window, 3=new tab in most recent window
@@ -445,7 +445,7 @@
 // Tabbed browser
 pref("browser.tabs.closeWindowWithLastTab", true);
 pref("browser.tabs.insertRelatedAfterCurrent", true);
-pref("browser.tabs.warnOnClose", true);
+pref("browser.tabs.warnOnClose", false);
 pref("browser.tabs.warnOnCloseOtherTabs", true);
 pref("browser.tabs.warnOnOpen", true);
 pref("browser.tabs.maxOpenBeforeWarn", 15);
@@ -636,7 +636,7 @@
 pref("browser.xul.error_pages.expert_bad_cert", false);
 
 // Enable captive portal detection.
-pref("network.captive-portal-service.enabled", true);
+pref("network.captive-portal-service.enabled", false);
 
 // If true, network link events will change the value of navigator.onLine
 pref("network.manage-offline-status", true);
@@ -1240,7 +1240,7 @@
 // Remembers if the about:newtab intro has been shown
 // NOTE: This preference is unused but was not removed in case
 //       this information will be valuable in the future.
-pref("browser.newtabpage.introShown", false);
+pref("browser.newtabpage.introShown", true);
 
 // Toggles the content of 'about:newtab'. Shows the grid when enabled.
 pref("browser.newtabpage.enabled", true);
@@ -1264,11 +1264,11 @@
 pref("browser.newtabpage.directory.source", "https://tiles.services.mozilla.com/v3/links/fetch/%LOCALE%/%CHANNEL%");
 
 // activates Activity Stream
-pref("browser.newtabpage.activity-stream.enabled", true);
-pref("browser.newtabpage.activity-stream.prerender", true);
-pref("browser.newtabpage.activity-stream.aboutHome.enabled", true);
+pref("browser.newtabpage.activity-stream.enabled", false);
+pref("browser.newtabpage.activity-stream.prerender", false);
+pref("browser.newtabpage.activity-stream.aboutHome.enabled", false);
 
-pref("browser.library.activity-stream.enabled", true);
+pref("browser.library.activity-stream.enabled", false);
 
 // Enable the DOM fullscreen API.
 pref("full-screen-api.enabled", true);
@@ -1330,7 +1330,7 @@
 // Some of these prefs are specified even though they are redundant; they are
 // here for clarity and end-user experiments.
 #ifndef EARLY_BETA_OR_EARLIER
-pref("geo.wifi.uri", "https://www.googleapis.com/geolocation/v1/geolocate?key=%GOOGLE_API_KEY%");
+pref("geo.wifi.uri", "");
 
 #ifdef XP_MACOSX
 pref("geo.provider.use_corelocation", false);
@@ -1347,20 +1347,20 @@
 #else
 
 // Geolocation preferences for Nightly/Aurora/Beta.
-pref("geo.wifi.uri", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");
+pref("geo.wifi.uri", "");
 
 #ifdef XP_MACOSX
-pref("geo.provider.use_corelocation", true);
+pref("geo.provider.use_corelocation", false);
 #endif
 
 // The native Windows location provider is only enabled in Nightly and likely to
 // be unstable. Set to false if things are really broken.
 #if defined(XP_WIN) && defined(NIGHTLY_BUILD)
-pref("geo.provider.ms-windows-location", true);
+pref("geo.provider.ms-windows-location", false);
 #endif
 
 #if defined(MOZ_WIDGET_GTK) && defined(MOZ_GPSD)
-pref("geo.provider.use_gpsd", true);
+pref("geo.provider.use_gpsd", false);
 #endif
 
 #endif
@@ -1481,32 +1481,32 @@
 
 // Telemetry settings.
 // Determines if Telemetry pings can be archived locally.
-pref("toolkit.telemetry.archive.enabled", true);
+pref("toolkit.telemetry.archive.enabled", false);
 // Enables sending the shutdown ping when Firefox shuts down.
-pref("toolkit.telemetry.shutdownPingSender.enabled", true);
+pref("toolkit.telemetry.shutdownPingSender.enabled", false);
 // Enables sending the shutdown ping using the pingsender from the first session.
 pref("toolkit.telemetry.shutdownPingSender.enabledFirstSession", false);
 // Enables sending a duplicate of the first shutdown ping from the first session.
-pref("toolkit.telemetry.firstShutdownPing.enabled", true);
+pref("toolkit.telemetry.firstShutdownPing.enabled", false);
 // Enables sending the 'new-profile' ping on new profiles.
-pref("toolkit.telemetry.newProfilePing.enabled", true);
+pref("toolkit.telemetry.newProfilePing.enabled", false);
 // Enables sending 'update' pings on Firefox updates.
-pref("toolkit.telemetry.updatePing.enabled", true);
+pref("toolkit.telemetry.updatePing.enabled", false);
 // Enables sending 'bhr' pings when the browser hangs.
-pref("toolkit.telemetry.bhrPing.enabled", true);
+pref("toolkit.telemetry.bhrPing.enabled", false);
 
 // Telemetry experiments settings.
-pref("experiments.enabled", true);
-pref("experiments.manifest.fetchIntervalSeconds", 86400);
-pref("experiments.manifest.uri", "https://telemetry-experiment.cdn.mozilla.net/manifest/v1/firefox/%VERSION%/%CHANNEL%");
+pref("experiments.enabled", false);
+pref("experiments.manifest.fetchIntervalSeconds", 0);
+pref("experiments.manifest.uri", "");
 // Whether experiments are supported by the current application profile.
-pref("experiments.supported", true);
+pref("experiments.supported", false);
 
 // Ping Centre Telemetry settings.
-pref("browser.ping-centre.telemetry", true);
+pref("browser.ping-centre.telemetry", false);
 pref("browser.ping-centre.log", false);
-pref("browser.ping-centre.staging.endpoint", "https://onyx_tiles.stage.mozaws.net/v3/links/ping-centre");
-pref("browser.ping-centre.production.endpoint", "https://tiles.services.mozilla.com/v3/links/ping-centre");
+pref("browser.ping-centre.staging.endpoint", "");
+pref("browser.ping-centre.production.endpoint", "");
 
 // Enable GMP support in the addon manager.
 pref("media.gmp-provider.enabled", true);

--- a/browser/branding/official/pref/firefox-branding.js
+++ b/browser/branding/official/pref/firefox-branding.js
@@ -3,7 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 pref("startup.homepage_override_url", "");
-pref("startup.homepage_welcome_url", "https://www.mozilla.org/%LOCALE%/firefox/%VERSION%/firstrun/");
+pref("startup.homepage_welcome_url", "about:blank");
 pref("startup.homepage_welcome_url.additional", "");
 // Interval: Time between checks for a new version (in seconds)
 pref("app.update.interval", 43200); // 12 hours
--- a/build/application.ini.in
+++ b/build/application.ini.in
@@ -41,7 +41,7 @@ MaxVersion=@GRE_MILESTONE@
 
 [XRE]
 #ifdef MOZ_PROFILE_MIGRATOR
-EnableProfileMigrator=1
+EnableProfileMigrator=0
 #endif
 
 #if MOZ_CRASHREPORTER
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -31,7 +31,7 @@
 
 pref("general.config.obscure_value", 13); // for MCD .cfg files
 
-pref("general.warnOnAboutConfig", true);
+pref("general.warnOnAboutConfig", false);
 
 // maximum number of dated backups to keep at any time
 pref("browser.bookmarks.max_backups",       5);
@@ -456,7 +456,7 @@
 pref("media.navigator.audio.use_fec", true);
 pref("media.navigator.video.red_ulpfec_enabled", false);
 
-pref("media.peerconnection.dtmf.enabled", true);
+pref("media.peerconnection.dtmf.enabled", false);
 
 pref("media.webrtc.debug.trace_mask", 0);
 pref("media.webrtc.debug.multi_log", false);
@@ -466,15 +466,15 @@
 
 pref("media.navigator.video.default_width",0);  // adaptive default
 pref("media.navigator.video.default_height",0); // adaptive default
-pref("media.peerconnection.enabled", true);
-pref("media.peerconnection.video.enabled", true);
+pref("media.peerconnection.enabled", false);
+pref("media.peerconnection.video.enabled", false);
 pref("media.navigator.video.max_fs", 12288); // Enough for 2048x1536
 pref("media.navigator.video.max_fr", 60);
 pref("media.navigator.video.h264.level", 31); // 0x42E01f - level 3.1
 pref("media.navigator.video.h264.max_br", 0);
 pref("media.navigator.video.h264.max_mbps", 0);
 pref("media.peerconnection.video.h264_enabled", false);
-pref("media.peerconnection.video.vp9_enabled", true);
+pref("media.peerconnection.video.vp9_enabled", false);
 pref("media.getusermedia.aec", 1);
 pref("media.getusermedia.browser.enabled", false);
 pref("media.getusermedia.channels", 0);
@@ -497,7 +497,7 @@
 pref("media.peerconnection.ice.force_interface", ""); // Limit to only a single interface
 pref("media.peerconnection.ice.relay_only", false); // Limit candidates to TURN
 pref("media.peerconnection.use_document_iceservers", true);
-pref("media.peerconnection.identity.enabled", true);
+pref("media.peerconnection.identity.enabled", false);
 pref("media.peerconnection.identity.timeout", 10000);
 pref("media.peerconnection.ice.stun_client_maximum_transmits", 7);
 pref("media.peerconnection.ice.trickle_grace_period", 5000);
@@ -508,7 +508,7 @@
 // These values (aec, agc, and noice) are from media/webrtc/trunk/webrtc/common_types.h
 // kXxxUnchanged = 0, kXxxDefault = 1, and higher values are specific to each
 // setting (for Xxx = Ec, Agc, or Ns).  Defaults are all set to kXxxDefault here.
-pref("media.peerconnection.turn.disable", false);
+pref("media.peerconnection.turn.disable", true);
 #if defined(MOZ_WEBRTC_HARDWARE_AEC_NS)
 pref("media.getusermedia.aec_enabled", false);
 pref("media.getusermedia.noise_enabled", false);
@@ -933,7 +933,7 @@
 //
 // Values are -1 always on. 1 always off, 0 is auto as some platform perform
 // further checks.
-pref("accessibility.force_disabled", 0);
+pref("accessibility.force_disabled", 1);
 
 pref("accessibility.AOM.enabled", false);
 
@@ -1381,7 +1381,7 @@
 // the popup will be called when the popup is dismissed.
 pref("privacy.permissionPrompts.showCloseButton", false);
 // Enforce tracking protection in all modes
-pref("privacy.trackingprotection.enabled",  false);
+pref("privacy.trackingprotection.enabled",  true);
 // Enforce tracking protection in Private Browsing mode
 pref("privacy.trackingprotection.pbmode.enabled",  true);
 // Annotate channels based on the tracking protection list in all modes
@@ -1757,7 +1757,7 @@
 
 // The maximum number of current global half open sockets allowable
 // when starting a new speculative connection.
-pref("network.http.speculative-parallel-limit", 6);
+pref("network.http.speculative-parallel-limit", 0);
 
 // Whether or not to block requests for non head js/css items (e.g. media)
 // while those elements load.
@@ -2066,7 +2066,7 @@
 pref("network.dnsCacheExpirationGracePeriod", 60);
 
 // This preference can be used to turn off DNS prefetch.
-pref("network.dns.disablePrefetch", false);
+pref("network.dns.disablePrefetch", true);
 
 // This preference controls whether .onion hostnames are
 // rejected before being given to DNS. RFC 7686
@@ -2105,7 +2105,7 @@
 
 // enables the prefetch service (i.e., prefetching of <link rel="next"> and
 // <link rel="prefetch"> URLs).
-pref("network.prefetch-next", true);
+pref("network.prefetch-next", false);
 // enables the preloading (i.e., preloading of <link rel="preload"> URLs).
 pref("network.preload", false);
 
@@ -2616,7 +2616,7 @@
 pref("services.settings.server", "https://firefox.settings.services.mozilla.com/v1");
 
 // Blocklist preferences
-pref("extensions.blocklist.enabled", true);
+pref("extensions.blocklist.enabled", false);
 // OneCRL freshness checking depends on this value, so if you change it,
 // please also update security.onecrl.maximum_staleness_in_seconds.
 pref("extensions.blocklist.interval", 86400);
@@ -4614,7 +4614,7 @@
 
 // Satchel (Form Manager) prefs
 pref("browser.formfill.debug",            false);
-pref("browser.formfill.enable",           true);
+pref("browser.formfill.enable",           false);
 pref("browser.formfill.expire_days",      180);
 pref("browser.formfill.agedWeight",       2);
 pref("browser.formfill.bucketSize",       1);
@@ -4738,7 +4738,7 @@
 pref("webgl.1.allow-core-profiles", false);
 #endif
 pref("webgl.force-enabled", false);
-pref("webgl.disabled", false);
+pref("webgl.disabled", true);
 pref("webgl.disable-angle", false);
 pref("webgl.disable-wgl", false);
 pref("webgl.min_capability_mode", false);
@@ -4952,13 +4952,13 @@
 pref("layers.gralloc.disable", false);
 
 // Enable/Disable the geolocation API for content
-pref("geo.enabled", true);
+pref("geo.enabled", false);
 
 // Timeout for outbound network geolocation provider XHR
 pref("geo.wifi.xhr.timeout", 60000);
 
 // Enable/Disable the orientation API for content
-pref("device.sensors.enabled", true);
+pref("device.sensors.enabled", false);
 
 // Enable/Disable the device storage API for content
 pref("device.storage.enabled", false);
@@ -5072,7 +5072,7 @@
 pref("dom.vibrator.max_vibrate_list_len", 128);
 
 // Battery API
-pref("dom.battery.enabled", true);
+pref("dom.battery.enabled", false);
 
 // Streams API
 pref("dom.streams.enabled", false);
@@ -5231,8 +5231,8 @@
 // remote-install allows any website to activate a provider, with extended UI
 // notifying user of installation. we can later pref off remote install if
 // necessary. This does not affect whitelisted and directory installs.
-pref("social.remote-install.enabled", true);
-pref("social.toast-notifications.enabled", true);
+pref("social.remote-install.enabled", false);
+pref("social.toast-notifications.enabled", false);
 
 // Disable idle observer fuzz, because only privileged content can access idle
 // observers (bug 780507).
@@ -5559,10 +5559,10 @@
 // The URL of the Firefox Accounts auth server backend
 pref("identity.fxaccounts.auth.uri", "https://api.accounts.firefox.com/v1");
 
-pref("beacon.enabled", true);
+pref("beacon.enabled", false);
 
 // Camera prefs
-pref("camera.control.face_detection.enabled", true);
+pref("camera.control.face_detection.enabled", false);
 
 
 // SW Cache API
@@ -5606,7 +5606,7 @@
 pref("browser.search.reset.enabled", false);
 pref("browser.search.reset.whitelist", "");
 pref("browser.search.geoSpecificDefaults", false);
-pref("browser.search.geoip.url", "https://location.services.mozilla.com/v1/country?key=%MOZILLA_API_KEY%");
+pref("browser.search.geoip.url", "");
 pref("browser.search.geoip.timeout", 3000);
 
 #ifdef MOZ_OFFICIAL_BRANDING
@@ -5620,7 +5620,7 @@
 //pref("media.gmp-manager.url.override", "");
 
 // Update service URL for GMP install/updates:
-pref("media.gmp-manager.url", "https://aus5.mozilla.org/update/3/GMP/%VERSION%/%BUILD_ID%/%BUILD_TARGET%/%LOCALE%/%CHANNEL%/%OS_VERSION%/%DISTRIBUTION%/%DISTRIBUTION_VERSION%/update.xml");
+pref("media.gmp-manager.url", "");
 
 // When |media.gmp-manager.cert.requireBuiltIn| is true or not specified the
 // final certificate and all certificates the connection is redirected to before
@@ -5645,14 +5645,14 @@
 // IMPORTANT! app.update.certs.* prefs should also be updated if these
 // are updated.
 pref("media.gmp-manager.cert.checkAttributes", true);
-pref("media.gmp-manager.certs.1.issuerName", "CN=DigiCert SHA2 Secure Server CA,O=DigiCert Inc,C=US");
-pref("media.gmp-manager.certs.1.commonName", "aus5.mozilla.org");
-pref("media.gmp-manager.certs.2.issuerName", "CN=thawte SSL CA - G2,O=\"thawte, Inc.\",C=US");
-pref("media.gmp-manager.certs.2.commonName", "aus5.mozilla.org");
+pref("media.gmp-manager.certs.1.issuerName", "");
+pref("media.gmp-manager.certs.1.commonName", "");
+pref("media.gmp-manager.certs.2.issuerName", "");
+pref("media.gmp-manager.certs.2.commonName", "");
 
 // Whether or not to perform reader mode article parsing on page load.
 // If this pref is disabled, we will never show a reader mode icon in the toolbar.
-pref("reader.parse-on-load.enabled", true);
+pref("reader.parse-on-load.enabled", false);
 
 // After what size document we don't bother running Readability on it
 // because it'd slow things down too much
--- a/toolkit/components/telemetry/healthreport-prefs.js
+++ b/toolkit/components/telemetry/healthreport-prefs.js
@@ -4,9 +4,9 @@
 
 /* global pref */
 
-pref("datareporting.healthreport.infoURL", "https://www.mozilla.org/legal/privacy/firefox.html#health-report");
+pref("datareporting.healthreport.infoURL", "");
 
 // Health Report is enabled by default on all channels.
-pref("datareporting.healthreport.uploadEnabled", true);
+pref("datareporting.healthreport.uploadEnabled", false);
 
-pref("datareporting.healthreport.about.reportUrl", "https://fhr.cdn.mozilla.net/%LOCALE%/v4/");
+pref("datareporting.healthreport.about.reportUrl", "");