Drupal 7: Error OMException: Blocked a frame with origin "" from accessing a cross-origin frame

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Add these line below to .htaccess file

<IfModule mod_headers.c>
  # Disable content sniffing, since it's an attack vector.
  Header always set X-Content-Type-Options nosniff
  Header always set Content-Security-Policy "frame-ancestors 'self'"
</IfModule>