$callback = $params['callback'];
if ( $callback !== null ) {
$callback = preg_replace( "/[^][.\\'\\\"_A-Za-z0-9]/", '', $callback );
- $this->printText( "$callback($json)" );
+ # Prepend a comment to try to avoid attacks against content
+ # sniffers, such as bug 68187.
+ $this->printText( "/**/$callback($json)" );
} else {
$this->printText( $json );
}