diff --git a/mozilla/webtools/bugzilla/.bzrrev b/mozilla/webtools/bugzilla/.bzrrev
index 3237fd7a2e2..7dc0ae4169d 100644
--- a/mozilla/webtools/bugzilla/.bzrrev
+++ b/mozilla/webtools/bugzilla/.bzrrev
@@ -1 +1 @@
-7419
\ No newline at end of file
+7420
\ No newline at end of file
diff --git a/mozilla/webtools/bugzilla/attachment.cgi b/mozilla/webtools/bugzilla/attachment.cgi
index 5bb2a85371a..8e69d388fd2 100755
--- a/mozilla/webtools/bugzilla/attachment.cgi
+++ b/mozilla/webtools/bugzilla/attachment.cgi
@@ -338,7 +338,8 @@ sub view {
     }
     print $cgi->header(-type=>"$contenttype; name=\"$filename\"",
                        -content_disposition=> "$disposition; filename=\"$filename\"",
-                       -content_length => $attachment->datasize);
+                       -content_length => $attachment->datasize,
+                       -x_content_type_options => "nosniff");
     disable_utf8();
     print $attachment->data;
 }