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Dark Mode Reader — Eye Protection, Night Theme & Screen Dimmer
The ultimate dark mode companion for Firefox. Reduce eye strain, block harsh blue light, customize your screen brightness, and automate your night reading.
🕶️ Product Overview
In today's digital world, we spend hours staring at bright screens, often in low-light environments. This constant exposure to high-intensity white light is the leading cause of digital eye strain, headaches, and sleep disruption.

Dark Mode Reader is a premium, lightweight, and highly customizable accessibility tool designed to solve this problem. It instantly transforms the blinding white backgrounds of every website into a soft, dark, and readable interface. By generating customizable dark themes on the fly, it shields your eyes from glare while preserving the visual integrity of images, videos, and interactive elements.

With advanced color-inversion technology, adjustable filters, preset color palettes, and smart scheduling automations, Dark Mode Reader is the most comprehensive dark theme utility available on the Firefox Add-ons Store.

🩺 The Science of Eye Care: Why Dark Mode Matters
Staring at bright white screens in a dark room suppresses the production of melatonin, the hormone responsible for sleep. The high-contrast blue light emitted by modern monitors leads to Computer Vision Syndrome (CVS), characterized by dry eyes, blurred vision, headaches, and physical fatigue.

Dark Mode Reader acts as an active blue light filter and screen dimmer that adapts to your environment. By turning down the luminance, it:

Reduces Eye Strain: Softens the contrast between the screen and your surrounding room.
Prevents Glare: Diminishes the harshness of late-night reading sessions.
Enhances Focus: Darker interfaces reduce visual distractions, allowing you to focus on content.
Saves Energy: On OLED and modern screens, darker pixels consume significantly less power, extending your laptop’s battery life.
⚡ Core Features (100% Free)
Unlike standard, static extensions that simply invert colors blindly, Dark Mode Reader uses an intelligent rendering engine to deliver a natural reading experience.

Smart Inversion Engine: Double-inverts media elements (images, videos, canvases, pictures, and SVGs) to preserve their original, true-to-life colors. You will never have to look at creepy inverted photos or unreadable color-swapped diagrams.
Precision Filters & Sliders:
Brightness (30% – 150%): Dim your screen below the browser's default limits or boost it for low-contrast sites.
Contrast (30% – 150%): Adjust text-to-background contrast to make reading easier on your eyes.
Sepia (0% – 100%): Add a warm, comforting amber tint to replicate paper-like reading.
Simple Master Toggle: Turn the extension on or off globally with a single click in the popup menu.
Keyboard Shortcut Support: Press Alt + Shift + D to toggle dark mode on the active tab instantly, without opening the popup interface.
Quick Domain Whitelist & Blacklist:
Disable Here: Add sites that already have native dark modes (like YouTube or GitHub) to your whitelist so the extension leaves them alone.
Force Dark: Blacklist stubborn sites that refuse to support dark styles, forcing them into a clean night mode regardless of global settings.
👑 Premium Features (Pro Lifetime Upgrade)
Unlock the full power of Dark Mode Reader with a one-time lifetime license. Designed for power users, developers, and night-owls.

Five Curated Preset Themes: Quickly switch between pre-designed styling profiles:
Midnight: Pitch black background (#000000) for absolute darkness and maximum battery savings.
Forest: A soothing, low-contrast dark green theme that reduces optical fatigue.
Ocean: Deep dark blue tones for a sleek, modern visual aesthetic.
Solarized: A scientifically designed low-contrast color profile for developers and readers.
Mellow: A warm, sepia-filter hybrid that makes late-night reading feel natural.
Custom Theme Creator: Take control of your browser's design. Use our integrated color picker to set your own custom background, text, and accent link colors.
Smart Scheduling Automations:
Sunset to Sunrise Geolocation: Sync the extension with your local coordinates to automatically enable dark mode at sunset and disable it at sunrise.
System Sync: Automatically match your extension state with your operating system's global light/dark preferences.
Custom Time Scheduling: Define exact start and end times (e.g., 8:00 PM to 7:00 AM) to automate your eye protection.
PDF Reader Dark Mode: Extend your night theme to local and web PDFs. Invert document pages using amber (warm paper), grayscale, or negative filters.
Per-Site Memory Overrides: Save unique slider settings, themes, and font configurations for individual domains. The extension remembers your settings automatically.
Precision Font Scaling (80% – 150%): Increase font sizes on hard-to-read sites to avoid leaning in and straining your neck.
Custom CSS Selectors Bypass: Manually insert CSS class or ID selectors to bypass inversion for specific elements, perfect for developers or niche websites.
Settings Backup & Import: Export all your custom whitelists, themes, and settings to a JSON file for easy synchronization across devices.
📊 Feature Comparison Matrix
Feature Free Tier Pro Tier
Smart Dark Mode (Inversion Filter) ✅ ✅
Brightness / Contrast / Sepia Sliders ✅ ✅
Global Key Shortcut (Alt + Shift + D) ✅ ✅
Active Tab Whitelist / Blacklist ✅ ✅
Grayscale & Font Scaling Controls ❌ ✅
Curated Presets (Midnight, Forest, Ocean) ❌ ✅
Custom Theme Color Pickers ❌ ✅
Sun-Relative Geolocation Scheduling ❌ ✅
OS Preferences Synchronization ❌ ✅
PDF Document Dark Mode ❌ ✅
Per-Site Memory (Unique Settings) ❌ ✅
Settings Backup & Restore (JSON) ❌ ✅
🛠️ Step-by-Step Configuration Guide
Getting started with Dark Mode Reader is incredibly simple:

Install & Pin the Add-on: Click the puzzle piece (Extensions) icon in your Firefox toolbar, click the gear icon next to Dark Mode Reader, and select Pin to Toolbar.
Access the Dashboard: Click the extension icon to open the clean glassmorphic popup. Toggle the master switch to enable or disable dark mode globally.
Tune Your Filters: Slide the Brightness, Contrast, and Sepia bars to find your optimal visual balance. If you are a Pro user, experiment with themes like Ocean or Forest.
Automate Your Schedule: Navigate to the Schedule tab in the Options panel. Choose whether you want dark mode on permanently, matching your operating system, or aligned with local sunset and sunrise times.
Exclude Native Sites: When visiting websites that already have high-quality native dark themes, click Disable Here in the popup to whitelist them and prevent double-styling.
🔒 Privacy-First Policy: No Tracking, No Analytics
Firefox users care deeply about security, and so do we. Dark Mode Reader is built on strict data minimization principles:

No Data Collection: We do not collect, store, or transmit your browsing history, clicks, text input, or IP addresses.
Local Processing: All operations, color rendering, and settings memory happen 100% locally on your computer.
No Adware/Spyware: The extension is entirely clean, containing no trackers, analytic beacons, or telemetry.
Secure License Check: Our Gumroad Pro license check uses a direct, secure API request solely to verify purchase keys, which is cached locally for 7 days to support offline use.
💬 Frequently Asked Questions (FAQ)
Q: Will this extension slow down my browser? A: No. Dark Mode Reader is built using vanilla JavaScript and CSS variables. It injects styles at document_start to prevent the common white flash before pages load. It has a tiny memory footprint (<50MB) and consumes virtually zero CPU cycles when idle.

Q: Why does the extension require permission to "Access your data for all websites"? A: To apply dark themes on the fly, the extension must be able to read and inject CSS rules into web pages. We do not inspect your input, store your history, or send any website data to external servers.

Q: How does the sunset/sunrise scheduling work? A: If enabled, you can click "Detect Location" to fetch your latitude and longitude. Using this data, the extension calculates the exact sunrise and sunset times for your location locally, without making any external API calls, updating the timers automatically each day.

Q: Can I use this in Private Browsing Windows? A: Yes! Make sure to check "Allow in Private Windows" in the extension settings within about:addons.