# System theme - auto (customized)

> Firefox already supports switching between a set of default dark/light themes based on your OS dark/light mode. This add-on allows you to select your own dark/light themes to match your OS.

Canonical page: [https://chrome-stats.com/d/system-theme-auto-customized](https://chrome-stats.com/d/system-theme-auto-customized)

## Overview

- **ID:** `system-theme-auto-customized`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Removed
- **Publisher:** Ivan
- **Daily users:** 1
- **Version:** 1.8
- **Last updated:** 2026-07-20
- **First published:** 2026-07-17
- **Size:** 11 KB
- **Data as of:** 2026-07-21
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/system-theme-auto-customized/)

## Permissions and access

### Permissions

- `management`
- `storage`
- `<all_urls>`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension is not longer available in the store

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

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Source: [Chrome-Stats](https://chrome-stats.com/d/system-theme-auto-customized)