How to keep Firefox from hiding images in Kohls.com emails sent to me through Yahoo Mail.

I have the latest Mozilla browser. I have Yahoo Mail and each time I open an email from Kohls.com, the images appear for a split second and then disappear and are replaced by a white box with a little symbol in the upper left corner. This only happens to about half of the images in the email. If I open the email in a separate tab, the email appears normal. This only occurs in Firefox, not in Edge nor Chrome. I have used aI to check all of my security settings and nothing is wrong with them, it is just something of how Firefox renders the Kohls.com emails. They are the only emails that act this way. Please help!