Midnight Lizard is a personalization extension for Firefox that allows users to customize color schemes across all websites. It offers a variety of predefined color schemes, including dark, light, grayscale, and colorful options. Users can modify existing schemes or create new ones tailored to their preferences. The extension also features options for adjusting brightness, saturation, and contrast to improve readability and accessibility. Additionally, it includes a blue light filter that shifts colors towards red light, helping to reduce eye strain during nighttime browsing.

Beyond basic customization, Midnight Lizard allows users to apply different color schemes on individual websites, schedule automatic activations, and utilize keyboard shortcuts for quick toggling. The extension is designed to work with local HTML files, and users can configure settings for backgrounds, text, and more. With options for performance improvement and flexibility in usage, Midnight Lizard is a powerful tool for enhancing the visual experience of web browsing.