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I'm able to download and see images in that chapter using Calibre 6.3 and FFF 4.15 in Win10.
If you are unable to update Firefox, are you also on an older version of Calibre? It does make a difference.
You might try adding the setting no_image_processing:true to personal.ini in FFF.
FFF wouldn't scale the images anymore then, so they may be unreasonably big on Kindle.
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