Click on the Advanced icon in the Options window.Click on Tools from the menu bar and select Options. Open the Mozilla Thunderbird email client.You can temporarily enable remote images by clicking on the “Show Remote Content” in the alert bar at the top of the message, but there is also a more permanent fix for those who want it. This is a security measure enacted to prevent viruses and other malicious devices from infiltrating your computer via email. By default, Mozilla Thunderbird disables the viewing of remote images in emails.