diff --git a/contrib/hgwebdir.fcgi b/contrib/hgwebdir.fcgi
--- a/contrib/hgwebdir.fcgi
+++ b/contrib/hgwebdir.fcgi
@@ -9,9 +9,9 @@
 # enable demandloading to reduce startup time
 from mercurial import demandimport; demandimport.enable()
 
-# send python tracebacks to the browser if an error occurs:
-import cgitb
-cgitb.enable()
+# Uncomment to send python tracebacks to the browser if an error occurs:
+#import cgitb
+#cgitb.enable()
 
 # If you'd like to serve pages with UTF-8 instead of your default
 # locale charset, you can do so by uncommenting the following lines.