diff --git a/scripts/99_deploy.sh b/scripts/99_deploy.sh
index 5630802..bc00c95 100644
--- a/scripts/99_deploy.sh
+++ b/scripts/99_deploy.sh
@@ -77,11 +77,11 @@ deploy_file() {
 }
 
 firefox_profile_dir() {
-    #   locate profile folder
+    # locate profile folder
 
     ffdir=/home/${user}/.mozilla/firefox/
 
-    if [ -z "$ffdir" ]
+    if not [ -d "$ffdir" ]
     then
         echo "firefox main directory not found: '${ffdir}'"
     else