Custom Dark Background by Cosmow22
A Firefox add-on that lets you change the background color to a dark shade of your choice.
1 User1 User
Extension Metadata
About this extension
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 : contact@cosmow22.fr
You can contribute to the project by adding a site via a pull request on the github page.
To test the project locally :
This project is licensed under the MIT License.
- chatgpt
- github
- gmail
- 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 : contact@cosmow22.fr
You can contribute to the project by adding a site via a pull request on the github page.
To test the project locally :
- download the project
- make your changes
- go to: about:debugging#/runtime/this-firefox
- click to "Load Temporary Add-on"
- select manifest.json
This project is licensed under the MIT License.
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Permissions and data
Required permissions:
- Access your data for all websites
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 1.2
- Size
- 29.71 KB
- Last updated
- 4 days ago (Sep 26, 2026)
- Related Categories
- License
- MIT License
- Version History
- Add to collection