There are no extensions that currently do such a thing. However, you might be interested in a content blocking service or dns based filtering service which can restrict or block websites that may contain higher amount of images that keep you from being calm. BlockSite is one popular site blocking extension, and NextDNS is a popular DNS content blocking service. There is also Block image, a browser extension that blocks all images and videos which would help you avoid images which would prevent you from staying calm.
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