# automaticDark - Time-Based Theme Changer

> Automatically change Firefox's theme based on the time.

Canonical page: [https://chrome-stats.com/d/automatic-dark](https://chrome-stats.com/d/automatic-dark)

## Overview

- **ID:** `automatic-dark`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** simonkhzhang
- **Category:** appearance
- **Daily users:** 25,325
- **Weekly downloads:** 629
- **Rating:** 4.35 / 5 (209 ratings)
- **Version:** 1.4.3
- **Last updated:** 2026-08-09
- **First published:** 2017-11-17
- **Size:** 93 KB
- **Data as of:** 2026-09-05
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/automatic-dark/)
- **Website:** [https://github.com/skhzhang/time-based-themes/issues](https://github.com/skhzhang/time-based-themes/issues)

## Description

**automaticDark** is a Firefox WebExtension designed to enhance your browsing experience by automatically switching themes based on the time of day. Enjoy a dark theme during nighttime to reduce eye strain and a light theme during the day for optimal visibility.

This extension offers multiple configuration options including automatic calculation of sunrise and sunset times using your geolocation, manual setting of these times, or switching themes according to your operating system's theme. It's a simple yet effective tool to keep your browser's appearance comfortable and adaptive without manual intervention.

For support and feedback, users can contact the developer via email or submit issues on GitHub. If you find the extension useful, consider leaving a rating or review to support its development.

## Rankings

- #452 — Overall
- #30 — Appearance
- #1 — angel
- #1 — automate
- #1 — automation
- #1 — base

## Permissions and access

### Permissions

- `alarms`
- `browserSettings`
- `management`
- `storage`
- `theme`

## Safety

- **Risk impact:** Low risk impact
- **Risk likelihood:** Very low risk likelihood

### Analysis details

- Manages other extensions, which allows oversight but might intervene with user configurations and choices.
- This extension was recently updated in the past month. New updates may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

Users generally praise the extension when it works, with strong positive sentiment (even calling it perfect). The core feature—time-based dark mode switching—is acknowledged, including cases where it activates at the scheduled time. However, reliability is a recurring concern: multiple reviews report the extension doesn’t function, or behaves inconsistently, undermining trust in its automated behavior.

### Pros

- Works perfectly; extension performs as expected.
- Positive sentiment; users love it and describe it as "Perfect!"
- Supports time-based switching to dark mode (scheduled activation)

### Cons

- Not working / reliability issues; some users report it doesn’t work at all.

## Similar extensions and apps

- [AutomaticDark - Time-Based Theme Changer](https://chrome-stats.com/d/automaticdark-change-theme) — 14 users, 5.00 / 5
- [Auto-DarkTheme Scheduler](https://chrome-stats.com/d/auto-darktheme-scheduler)
- [Auto theme switcher](https://chrome-stats.com/d/auto-theme-switcher) — 46 users, 3.80 / 5
- [Theme Changer Pro](https://chrome-stats.com/d/theme-changer-pro)
- [System theme - auto (customized)](https://chrome-stats.com/d/system-theme-auto-customized) — 1 users
- [Auto theme changer](https://chrome-stats.com/d/auto-theme-changer) — 116 users, 4.83 / 5
- [Adaptive Theme Changer](https://chrome-stats.com/d/adaptive-theme-changer) — 1 users
- [Auto Dark Mode is](https://chrome-stats.com/d/auto-dark-mode-is) — 1 users
- [Themeinator](https://chrome-stats.com/d/themeinator) — 1 users
- [Automatic Dark Mode Switcher](https://chrome-stats.com/d/automatic-dark-mode-switcher) — 1 users
- [Dynamic Time Theme Cursor](https://chrome-stats.com/d/dynamic-time-theme-cursor) — 2 users, 5.00 / 5
- [Auto Dark Mode Switcher](https://chrome-stats.com/d/auto-dark-mode-switcher-bet88)

---

Source: [Chrome-Stats](https://chrome-stats.com/d/automatic-dark)