Font Contrast от Francesco Fusco

Free and open-source add-on created to combat the trend of unreadable website designs. It's lightweight and fast, even on huge websites.

Features highlights:

• Turn hard to read text to black (or a darker shade)
• Enlarge small fonts
• Increase font boldness
• Easy to toggle: click on the icon or press a shortcut (default: Shift+F1)
• Address bar button to quickly set up website-specific options

This program is free software. The source code is released under the terms of the GNU General Public License v3.0. If you found it useful, you can buy me a coffe.