The following worrks well in Firefox & some others: <img src="data:image/x-icon;base64,AAABAAEAEBAAAAAAAABoBQAAFgAAACgAAAAQAAAAIAAAAAEACAAAAAAAQAEAAAAAAAAAAAAAAAAA AAAAAAAAAAAA////ALx8TgBSRD4AuLa4AIaBhgA+FQUAjlAtAN7a2gB5ZF4AtZ+MACIgJgBfLRYA zZNwAJ50YQCmZj4AQSskAG1BKwCqh3gA1LmqAM7GyADy6+oAoJ6hABwTDABfWV0AgVhGADo5OgBp TUUAy4paAJmQkAAzHBcAf3JuAJV9cgB8TDQAVE5SALejngCve2MAqHNSAMm8uADDsKwAUi8hALRx RQCql