--- mozilla-esr38.bak/browser/branding/official/pref/firefox-branding.js	2015-10-27 10:35:06.279469072 +0100
+++ mozilla-esr38/browser/branding/official/pref/firefox-branding.js	2015-10-27 11:45:37.837884736 +0100
@@ -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","");
+pref("startup.homepage_welcome_url","about:blank");
 // Interval: Time between checks for a new version (in seconds)
 pref("app.update.interval", 43200); // 12 hours
 // The time interval between the downloading of mar file chunks in the
--- mozilla-esr38.bak/services/healthreport/healthreport-prefs.js	2015-10-27 10:35:06.443469088 +0100
+++ mozilla-esr38/services/healthreport/healthreport-prefs.js	2015-10-27 11:57:35.057955188 +0100
@@ -18,9 +18,9 @@
 pref("datareporting.healthreport.pendingDeleteRemoteData", false);
 
 // Health Report is enabled by default on all channels.
-pref("datareporting.healthreport.uploadEnabled", true);
+pref("datareporting.healthreport.uploadEnabled", false);
 
-pref("datareporting.healthreport.service.enabled", true);
+pref("datareporting.healthreport.service.enabled", false);
 pref("datareporting.healthreport.service.loadDelayMsec", 10000);
 pref("datareporting.healthreport.service.loadDelayFirstRunMsec", 60000);
 
--- mozilla-esr38.bak/browser/app/profile/firefox.js	2015-10-27 10:35:06.353469080 +0100
+++ mozilla-esr38/browser/app/profile/firefox.js	2015-10-27 11:51:27.217919055 +0100
@@ -267,12 +267,12 @@
 #endif
 
 // 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);
 
 // 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");
 
 pref("browser.slowStartup.notificationDisabled", false);
@@ -442,7 +442,7 @@
 // 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);
@@ -1629,7 +1629,7 @@
 pref("browser.newtab.preload", true);
 
 // Remembers if the about:newtab intro has been shown
-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);
--- mozilla-esr38.bak/modules/libpref/init/all.js	2015-10-27 10:35:06.654469109 +0100
+++ mozilla-esr38/modules/libpref/init/all.js	2015-10-27 11:57:53.203956970 +0100
@@ -29,7 +29,7 @@
 
 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);
@@ -449,7 +449,7 @@
 #if defined(XP_WIN) || defined(XP_MACOSX)
 pref("media.mediasource.enabled", true);
 #else
-pref("media.mediasource.enabled", false);
+pref("media.mediasource.enabled", true);
 #endif
 
 #ifdef RELEASE_BUILD
@@ -2312,7 +2312,7 @@
 // Player ("Shockwave for Director"). To hide all plugins from enumeration, use
 // the empty string "" to match no plugin names. To allow all plugins to be
 // enumerated, use the string "*" to match all plugin names.
-pref("plugins.enumerable_names", "*");
+pref("plugins.enumerable_names", "");
 
 // The default value for nsIPluginTag.enabledState (STATE_ENABLED = 2)
 pref("plugin.default.state", 2);
@@ -3400,7 +3400,7 @@
 
 // Middle-mouse handling
 pref("middlemouse.paste", true);
-pref("middlemouse.contentLoadURL", true);
+pref("middlemouse.contentLoadURL", false);
 pref("middlemouse.openNewWindow", true);
 pref("middlemouse.scrollbarPosition", true);
 
@@ -3712,7 +3712,7 @@
 
 // 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.saveHttpsForms",   true);
 pref("browser.formfill.agedWeight",       2);