Dimmer is a free Firefox add-on that effectively reduces eye strain by applying a dark overlay to web pages. This user-friendly tool enhances comfort during long browsing sessions by allowing users to adjust brightness levels with ease. Featuring customizable keyboard shortcuts, users can quickly access dimming functions, enabling a smoother experience whether on a single tab or across multiple tabs. This versatility makes it an ideal choice for individuals who are sensitive to bright screens.

The add-on offers flexibility in its settings, allowing users to choose between sharing the dimming state across all tabs or maintaining individual states for each tab. This capability ensures that preferences are met for both new and existing tabs, making it easy to switch between modes as needed. Overall, Dimmer serves as an effective solution for personalizing the browsing experience, particularly for those who navigate content-rich websites frequently.