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Can we also make an extension for simulating bad eyesight that everyone who makes websites with thin gray text would be forced to install?

In Chrome with DevTools open you can hit CTRL + SHIFT + P to open command menu and run "emulate blurred vision". It's not enforced though :)

Those already exist. You can simulate things like color blindness, tunnel vision, low contrast vision, and blurred vision, among other effects.

Yeah, I was talking about the forced part :)