--- firefox-66.0.3/browser/app/profile/firefox.js.orig	2019-04-09 21:59:43.000000000 +0200
+++ firefox-66.0.3/browser/app/profile/firefox.js	2019-04-22 16:01:43.348625457 +0200
@@ -53,7 +53,7 @@
 
 // Disable add-ons that are not installed by the user in all scopes by default.
 // See the SCOPE constants in AddonManager.jsm for values to use here.
-pref("extensions.autoDisableScopes", 15);
+pref("extensions.autoDisableScopes", 3);
 // Scopes to scan for changes at startup.
 pref("extensions.startupScanScopes", 0);
 
@@ -140,7 +140,7 @@
 // should no longer be used directly. Instead, getAppUpdateAutoEnabled and
 // getAppUpdateAutoEnabled from UpdateUtils.jsm should be used.
 #ifndef XP_WIN
-  pref("app.update.auto", true);
+  pref("app.update.auto", false);
 #endif
 
 // If set to true, the Update Service will apply updates in the background
@@ -227,7 +227,7 @@
 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);
@@ -501,6 +501,8 @@
 // Whether menu should close after Ctrl-click, middle-click, etc.
 pref("browser.bookmarks.openInTabClosesMenu", true);
 
+pref("intl.locale.matchOS", true);
+
 // Where new bookmarks go by default.
 // Use PlacesUIUtils.defaultParentGuid to read this; do NOT read the pref
 // directly.
@@ -646,7 +648,7 @@
 pref("mousewheel.with_control.action",3);
 pref("mousewheel.with_win.action", 1);
 
-pref("browser.xul.error_pages.expert_bad_cert", false);
+pref("browser.xul.error_pages.expert_bad_cert", true);
 pref("browser.xul.error_pages.show_safe_browsing_details_on_load", false);
 
 // Enable captive portal detection.
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1510,7 +1510,7 @@ pref("layout.css.visited_links_enabled", true);
 // A value of 0 means use the system DPI. A positive value is used as the DPI.
 // This sets the physical size of a device pixel and thus controls the
 // interpretation of physical units such as "pt".
-pref("layout.css.dpi", -1);
+pref("layout.css.dpi", 0);
 
 // pref for which side vertical scrollbars should be on
 // 0 = end-side in UI direction