Page Shadow is a free dark mode extension designed for Firefox that significantly improves the readability of web pages in low-light conditions. This personalization tool offers multiple features such as increasing page contrast, applying various dark theme colors, and allowing users to create custom themes. Additionally, it provides options to decrease brightness, invert colors, and attenuate image colors, making it versatile for different user preferences.

The extension also includes a night mode that applies an orange filter to reduce blue light emission, enhancing comfort during nighttime browsing. Users can easily access all these features with a single click from the extension menu. Page Shadow allows for extensive customization, enabling specific settings for different websites and the ability to disable the extension on selected pages, ensuring a tailored browsing experience.