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diff -up firefox-45.0.1/extensions/pref/autoconfig/src/nsReadConfig.cpp.1170092 firefox-45.0.1/extensions/pref/autoconfig/src/nsReadConfig.cpp
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--- firefox-45.0.1/extensions/pref/autoconfig/src/nsReadConfig.cpp.1170092	2016-03-15 23:37:54.000000000 +0100
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+++ firefox-45.0.1/extensions/pref/autoconfig/src/nsReadConfig.cpp	2016-03-21 16:10:42.540417899 +0100
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@@ -245,8 +245,20 @@ nsresult nsReadConfig::openAndEvaluateJS
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             return rv;
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         rv = NS_NewLocalFileInputStream(getter_AddRefs(inStr), jsFile);
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-        if (NS_FAILED(rv)) 
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-            return rv;
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+        if (NS_FAILED(rv)) {
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+          // Look for cfg file in /etc/<application>/pref
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+          rv = NS_GetSpecialDirectory(NS_APP_PREFS_SYSTEM_CONFIG_DIR,
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+                                      getter_AddRefs(jsFile));
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+          NS_ENSURE_SUCCESS(rv, rv);
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+
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+          rv = jsFile->AppendNative(NS_LITERAL_CSTRING("pref"));
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+          NS_ENSURE_SUCCESS(rv, rv);
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+          rv = jsFile->AppendNative(nsDependentCString(aFileName));
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+          NS_ENSURE_SUCCESS(rv, rv);
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+
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+          rv = NS_NewLocalFileInputStream(getter_AddRefs(inStr), jsFile);
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+          NS_ENSURE_SUCCESS(rv, rv);
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+        }
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     } else {
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         nsAutoCString location("resource://gre/defaults/autoconfig/");
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diff -up firefox-45.0.1/modules/libpref/Preferences.cpp.1170092 firefox-45.0.1/modules/libpref/Preferences.cpp
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--- firefox-45.0.1/modules/libpref/Preferences.cpp.1170092	2016-03-21 16:10:42.540417899 +0100
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+++ firefox-45.0.1/modules/libpref/Preferences.cpp	2016-03-21 16:13:29.145888710 +0100
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@@ -1214,6 +1214,8 @@ static nsresult pref_InitInitialObjects(
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   // - jar:$gre/omni.jar!/defaults/preferences/*.js
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   // Thus, in omni.jar case, we always load app-specific default preferences
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   // from omni.jar, whether or not $app == $gre.
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+  // At very end load configuration from system config location:
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+  // - /etc/firefox/pref/*.js
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   nsZipFind *findPtr;
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   nsAutoPtr<nsZipFind> find;
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diff -up firefox-45.0.1/toolkit/xre/nsXREDirProvider.cpp.1170092 firefox-45.0.1/toolkit/xre/nsXREDirProvider.cpp
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--- firefox-45.0.1/toolkit/xre/nsXREDirProvider.cpp.1170092	2016-03-15 23:37:46.000000000 +0100
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+++ firefox-45.0.1/toolkit/xre/nsXREDirProvider.cpp	2016-03-21 16:12:06.498655156 +0100
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@@ -51,6 +51,7 @@
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 #endif
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 #ifdef XP_UNIX
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 #include <ctype.h>
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+#include "nsIXULAppInfo.h"
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 #endif
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 #ifdef XP_IOS
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 #include "UIKitDirProvider.h"
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@@ -457,6 +458,20 @@ nsXREDirProvider::GetFile(const char* aP
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       }
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     }
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   }
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+#if defined(XP_UNIX)
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+  if (!strcmp(aProperty, NS_APP_PREFS_SYSTEM_CONFIG_DIR)) {
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+    nsCString sysConfigDir = NS_LITERAL_CSTRING("/etc/");
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+    nsCOMPtr<nsIXULAppInfo> appInfo = do_GetService("@mozilla.org/xre/app-info;1");
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+    if (!appInfo)
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+      return NS_ERROR_NOT_AVAILABLE;
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+    nsCString appName;
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+    appInfo->GetName(appName);
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+    ToLowerCase(appName);
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+    sysConfigDir.Append(appName);
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+    return NS_NewNativeLocalFile(sysConfigDir, false, aFile);
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+  }
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+#endif
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+
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   if (NS_FAILED(rv) || !file)
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     return NS_ERROR_FAILURE;
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@@ -753,6 +768,14 @@ nsXREDirProvider::GetFilesInternal(const
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     LoadDirIntoArray(mXULAppDir, kAppendPrefDir, directories);
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     LoadDirsIntoArray(mAppBundleDirectories,
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                       kAppendPrefDir, directories);
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+    // Add /etc/<application>/pref/ directory if it exists
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+    nsCOMPtr<nsIFile> systemPrefDir;
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+    rv = NS_GetSpecialDirectory(NS_APP_PREFS_SYSTEM_CONFIG_DIR, getter_AddRefs(systemPrefDir));
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+    if (NS_SUCCEEDED(rv)) {
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+      rv = systemPrefDir->AppendNative(NS_LITERAL_CSTRING("pref"));
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+      if (NS_SUCCEEDED(rv))
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+        directories.AppendObject(systemPrefDir);
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+    }
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     rv = NS_NewArrayEnumerator(aResult, directories);
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   }
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diff -up firefox-45.0.1/xpcom/io/nsAppDirectoryServiceDefs.h.1170092 firefox-45.0.1/xpcom/io/nsAppDirectoryServiceDefs.h
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--- firefox-45.0.1/xpcom/io/nsAppDirectoryServiceDefs.h.1170092	2016-03-15 23:37:47.000000000 +0100
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+++ firefox-45.0.1/xpcom/io/nsAppDirectoryServiceDefs.h	2016-03-21 16:10:42.541417902 +0100
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@@ -67,6 +67,7 @@
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 #define NS_APP_PREFS_DEFAULTS_DIR_LIST          "PrefDL"
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 #define NS_EXT_PREFS_DEFAULTS_DIR_LIST          "ExtPrefDL"
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 #define NS_APP_PREFS_OVERRIDE_DIR               "PrefDOverride" // Directory for per-profile defaults
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+#define NS_APP_PREFS_SYSTEM_CONFIG_DIR          "PrefSysConf"   // Directory with system-wide configuration
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 #define NS_APP_USER_PROFILE_50_DIR              "ProfD"
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 #define NS_APP_USER_PROFILE_LOCAL_50_DIR        "ProfLD"