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Terrible background choice for this article!

I had to disable the body background-color with the web inspector to see any of the animal heads!

You can also drag the images. At least Firefox will put a white background on the dragged thumbnail.

I am not seeing that on Firefox (beta/157) on Linux or Mac.

Maybe it depends on your Firefox/system theme.

FWIW, the Readability extension sorted it in a single click for me.