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.