diff --git a/images/linux/scripts/installers/firefox.sh b/images/linux/scripts/installers/firefox.sh
index 8a849c85..e6e28afd 100644
--- a/images/linux/scripts/installers/firefox.sh
+++ b/images/linux/scripts/installers/firefox.sh
@@ -17,6 +17,10 @@ if ! command -v firefox; then
     exit 1
 fi
 
+# add to gloabl system preferences for firefox locale en_US, because other browsers have en_US local.
+# Default firefox local is en_GB
+echo 'pref("intl.locale.requested","en_US");' >> "/usr/lib/firefox/browser/defaults/preferences/syspref.js"
+
 # Document what was added to the image
 echo "Lastly, documenting what we added to the metadata file"
 # Resolves: Running Firefox as root in a regular user's session is not supported.