You seam to have defined 2 images there and only one exists on your server.
Firefox just ignores the images defined in HTML tags but that are not on the server while other browsers are displaying an empty space.
You need to either remove the HTML tag defining the image or upload the image defined in the HTML tag.
By the way, this problem is in no way related to aiContactSafe. You defined the images in a module that you happened to publish on the same page as aiContactSafe.