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The text doesn't use an `f`. If you copy from e.g. the 1700 passage you get `ſ` not `f`.
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Probably people are confused by ligatures. Indeed it is a long S.
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This is correct. And if you don't like that font's long-s, you can fix it with

document.body.style.fontFamily = "Baskerville";

Baskerville has a nice long-s. TNR is also not bad. Garamond is passable.

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I should have noticed, it has a full cross bar, I guess it's my fading eyesight and also the white text of green is perhaps not the best contrast.
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It doesn't have such a bar in the article e.g. "swifter" https://imgur.com/a/XwsoVgB
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