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Narrow font on some websites

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On websites that renders text in the users' installed fonts, the text gets rendered in Arial Narrow. This only happens on Firefox; attached are screenshots of https://nyaa.si/ and https://mpv.io/ on Firefox and in Chromium.

A quick glance at about:config with the search term "font" shows no modified settings.

Any fixes?

On websites that renders text in the users' installed fonts, the text gets rendered in Arial Narrow. This only happens on Firefox; attached are screenshots of https://nyaa.si/ and https://mpv.io/ on Firefox and in Chromium. A quick glance at about:config with the search term "font" shows no modified settings. Any fixes?
Attached screenshots

Chosen solution

I fixed it!

If anyone comes here with the same problem, here's a solution courtesy of Reddit user u/CJG008: Go to about:config and change layout.css.font-visibility.level from 3 to 1.

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Chosen Solution

I fixed it!

If anyone comes here with the same problem, here's a solution courtesy of Reddit user u/CJG008: Go to about:config and change layout.css.font-visibility.level from 3 to 1.