To mitigate the tracking problem, Firefox only defers loading of images when JS is enabled: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#attr-

To mitigate the tracking problem, Firefox only defers loading of images when JS is enabled: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#attr-loading https://developer.mozilla.org/en-US/docs/Web/HTML/Element/im... Chrome seemed to behave this way as well when I tested it a while ago. It's covered in the spec: https://html.spec.whatwg.org/multipage/urls-and-fetching.html#lazy-loading-attributes https://html.spec.whatwg.org/multipage/urls-and-fetching.htm...