stackoverflow: save theme preference

Question

Suddenly today stackoverflow looks like this:

The blue color is undesired.

I tried to change the theme under settings. The theme is correctly applied, but I don't see a way to save it: As soon as I leave the settings page, the blue colors are back.

What can I do to get to permanently revert to the default look?

UPDATE

Could this be a virus? Heres' what I get on Safari:

I'm on MacOS Monterey. The first screenshot is on Firefox, the second screenshot on Safari. Chrome also gives different colors.

Answer 1

On the "FILTERS" bar at the bottom of your screen, click on the "circle with slash" icon. It will revert your screen to the default view.