# Custom Dark Background

> A Firefox add-on that lets you change the background color to a dark shade of your choice.

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

## Overview

- **ID:** `my-custom-dark-background`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Cosmow22
- **Category:** appearance
- **Daily users:** 1
- **Weekly downloads:** 2
- **Version:** 1.1
- **Last updated:** 2026-09-05
- **First published:** 2026-08-01
- **Size:** 17 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/my-custom-dark-background/)

## Description

Works on:
- chatgpt
- github
- gmail
- google
- qwant
- radiofrance
- twitch
- wikipedia (fr)
- youtube

Important for better compatibility :
- enable dark mode on your favourite websites in their settings
- on YouTube, turn off ambient mode

Any questions, requests or suggestions? 
Or would you like to suggest a website to be added?
Please contact me at the following address : <a href="/" rel="nofollow">contact@cosmow22.fr</a>

You can contribute to the project by adding a site via a pull request on the <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/a0a4710585789acdb868bd5d3faa80c1cccc2f4272009df27812ac24571a5f00/https%3A//github.com/Cosmow22/custom-dark-background" rel="nofollow">github page</a>.

To test the project locally :
<ol><li>download the project</li><li>make your changes</li><li>go to: about:debugging#/runtime/this-firefox</li><li>click to "Load Temporary Add-on"</li><li>select manifest.json</li></ol>

This project is licensed under the MIT License.

## Rankings

- #117,620 — Overall
- #8 — custom background
- #184 — background
- #202 — hd backgrounds

## Permissions and access

### Permissions

- `storage`

### Content script matches

- `<all_urls>`
- `*.youtube.com`
- `*.chatgpt.com`
- `*.mail.google.com`
- `*.qwant.com`
- `*.google.com`
- `*.radiofrance.fr`
- `*.github.com`
- `*.twitch.tv`
- `*.fr.wikipedia.org`

## Safety

- **Risk impact:** Very high 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 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).

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