You can click the shield icon in the location/address bar to disable Content Blocking for this website.

Firefox shows the shield icon at the left end of the location/address bar in case Content Blocking is blocking content.

• click the shield icon for more detail and possibly disable the protection

You can check the Web Console about what content is blocked

• "3-bar" menu button or Tools -> Web Developer
• https://support.mozilla.org/en-US/kb/tracking-protection
• https://support.mozilla.org/en-US/kb/content-blocking

If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block (wanted) content (Adblock Plus, NoScript, Disconnect, Ghostery, Privacy Badger, uBlock Origin) always make sure such extensions do not block (wanted) content.

• make sure your extensions and filters are updated to the latest version
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

If the images are hosted on servers that are blocked by this "Deceptive Content and Dangerous Software Protection" feature then there is not much you can do about this. Having this security feature disabled permanently is not recommended.

From what domain do these images come from?

See also:

• https://support.mozilla.org/en-US/kb/how-does-phishing-and-malware-protection-work