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Bold font

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After second to last update Firefox doesn't show bold fonts on my website. In Chrome everything is ok. This issue shows on diffrent computers and diffrent windows version. How to fix it?

After second to last update Firefox doesn't show bold fonts on my website. In Chrome everything is ok. This issue shows on diffrent computers and diffrent windows version. How to fix it?

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This problem only affects one website -- other sites are fine? Does the site use a downloadable web font or a common built-in font (like Arial or Times New Roman)?

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You can right-click and select "Inspect" to open the built-in Inspector with this element selected.

You can check in the Rules tab in the right panel in the Inspector what font-family is used for selected text. You can check in the Fonts tab in the right panel in the Inspector what font is actually used because Firefox might be using a different font than specified by the website.