diff --git a/browser/app/profile/firefox.js b/browser/app/profile/firefox.js
index 02aa908..e6ff139 100644
--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -413,6 +413,9 @@
 pref("general.warnOnAboutConfig",                 false);
 #endif
 
+// Use system environment variable to choose locale
+pref("intl.locale.matchOS", true);
+
 // This is the pref to control the location bar, change this to true to 
 // force this - this makes the origin of popup windows more obvious to avoid
 // spoofing. We would rather not do it by default because it affects UE for web