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A comment on Show HN: Grayscale the Web – A Chrome extension to help avoid mindless browsing. Parent comment
If you're talking about mobile safari though, you can do it on an OS level and toggle it by pressing the home button three times in a row - https://www.ped30.com/2018/01/13/apple-iphone-gray/
If you're talking about mobile safari though, you can do it on an OS level and toggle it by pressing the home button three times in a row - https://www.ped30.com/2018/01/13/apple-iphone-gray/