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diff -up firefox-68.5.0/extensions/pref/autoconfig/src/nsReadConfig.cpp.1170092 firefox-68.5.0/extensions/pref/autoconfig/src/nsReadConfig.cpp
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--- firefox-68.5.0/extensions/pref/autoconfig/src/nsReadConfig.cpp.1170092	2020-02-07 01:27:03.000000000 +0100
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+++ firefox-68.5.0/extensions/pref/autoconfig/src/nsReadConfig.cpp	2020-02-24 11:30:32.058044651 +0100
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@@ -246,8 +246,20 @@ nsresult nsReadConfig::openAndEvaluateJS
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     if (NS_FAILED(rv)) return rv;
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     rv = NS_NewLocalFileInputStream(getter_AddRefs(inStr), jsFile);
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-    if (NS_FAILED(rv)) 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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+      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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     location += aFileName;
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diff -up firefox-68.5.0/modules/libpref/Preferences.cpp.1170092 firefox-68.5.0/modules/libpref/Preferences.cpp
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--- firefox-68.5.0/modules/libpref/Preferences.cpp.1170092	2020-02-24 11:30:32.059044645 +0100
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+++ firefox-68.5.0/modules/libpref/Preferences.cpp	2020-02-24 11:35:14.613443673 +0100
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@@ -4436,6 +4436,8 @@ static nsresult pref_ReadDefaultPrefs(co
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   //
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   // Thus, in the omni.jar case, we always load app-specific default
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   // preferences 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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   nsresult rv = NS_ERROR_FAILURE;
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   nsZipFind* findPtr;
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diff -up firefox-68.5.0/toolkit/xre/nsXREDirProvider.cpp.1170092 firefox-68.5.0/toolkit/xre/nsXREDirProvider.cpp
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--- firefox-68.5.0/toolkit/xre/nsXREDirProvider.cpp.1170092	2020-02-07 01:28:06.000000000 +0100
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+++ firefox-68.5.0/toolkit/xre/nsXREDirProvider.cpp	2020-02-24 11:34:27.284704700 +0100
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@@ -61,6 +61,7 @@
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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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@@ -524,6 +525,21 @@ nsXREDirProvider::GetFile(const char* aP
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       }
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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) return NS_ERROR_FAILURE;
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   if (ensureFilePermissions) {
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@@ -880,6 +896,17 @@ nsresult nsXREDirProvider::GetFilesInter
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     LoadDirIntoArray(mXULAppDir, kAppendPrefDir, directories);
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     LoadDirsIntoArray(mAppBundleDirectories, 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,
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+                                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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+    }
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+
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     rv = NS_NewArrayEnumerator(aResult, directories, NS_GET_IID(nsIFile));
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   } else if (!strcmp(aProperty, NS_APP_CHROME_DIR_LIST)) {
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     // NS_APP_CHROME_DIR_LIST is only used to get default (native) icons
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diff -up firefox-68.5.0/xpcom/io/nsAppDirectoryServiceDefs.h.1170092 firefox-68.5.0/xpcom/io/nsAppDirectoryServiceDefs.h
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--- firefox-68.5.0/xpcom/io/nsAppDirectoryServiceDefs.h.1170092	2020-02-07 01:27:52.000000000 +0100
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+++ firefox-68.5.0/xpcom/io/nsAppDirectoryServiceDefs.h	2020-02-24 11:30:32.059044645 +0100
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@@ -62,6 +62,7 @@
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 #define NS_APP_PREFS_DEFAULTS_DIR_LIST "PrefDL"
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 #define NS_APP_PREFS_OVERRIDE_DIR \
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   "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"