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A mystery: On this page, two tabs in Firefox show slightly different brightnesses for a color image from one tab to another. This is clear if I click one tab, then the other, precisely comparing them (on the same monitor).

If I copy the URL into multiple tabs, some are brighter and some darker. (So it's not that my monitor brightness changed just as I opened a tab.)

But in general, this will be hard for you to reproduce.

These are all ordinary tabs, not Private or Incognito.

The black-and-white image does not vary.

The underlying webp files are the same.

Perhaps some sort of A/B testing on CSS? I inspected the CSS and didn't find anything

See the collar here: Light Light Dark Dark

Firefox 88.0.1 on Macbook OSX 10.15.7

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