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To make bold text in Firefox, you can use CSS by applying the `font-weight: bold;` property in your styles. If you're looking to enhance the readability of text across websites in Firefox, you can adjust the font settings:
1. Open **Firefox Settings**. 2. Navigate to **General > Fonts & Colors**. 3. Choose a bold typeface and adjust sizes for better visibility.
For specific bold font issues, check for custom themes or extensions that might override default styles.