How to fix: Firefox uses incorrect fonts on all webpages, regardless of their CSS
If you encounter a Firefox that does not care about your font settings but always uses specific fonts, you can fix that. Usually this should not happen, as it's not a default setting:
- Open up the Preferences.
- Switch to "Content".
- In the "Fonts & Colors" section, click the "Advanced..." button.
- Tick "Allow pages to choose their own fonts, instead of my selection above".
- Confirm by pressing "OK".
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