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Why all srcset images being downloaded?

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Why all srcset images being downloaded including the largest original size?. On Chrome, only downloads the need-displayed image size so it took only 1.5MB to load my home page while Firefox took 2.5MB. How does this happen?

Why all srcset images being downloaded including the largest original size?. On Chrome, only downloads the need-displayed image size so it took only 1.5MB to load my home page while Firefox took 2.5MB. How does this happen?

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Could you link to a page that has this problem? I looked at a couple demo pages and watched what Firefox loaded in the Network Monitor* and didn't see any additional images loading before I triggered them:

* More info: https://developer.mozilla.org/docs/Tools/Network_Monitor