Backed out changeset fec126cd7f6e (bug 1764544) for causing marionette failures on test_win32k_enrollment.py.

toolkit/xre/nsAppRunner.cpp

@@ -5486,14 +5486,14 @@ nsresult XREMain::XRE_mainRun() {
     appStartup = components::AppStartup::Service();
     NS_ENSURE_TRUE(appStartup, NS_ERROR_FAILURE);
 
+    mDirProvider.DoStartup();
+
 #ifdef XP_WIN
     // It needs to be called on the main thread because it has to use
     // nsObserverService.
     EnsureWin32kInitialized();
 #endif
 
-    mDirProvider.DoStartup();
-
     // As FilePreferences need the profile directory, we must initialize right
     // here.
     mozilla::FilePreferences::InitDirectoriesWhitelist();