Website and IP address blocker от Mohsin Dodhia

FAQ:
How to use on Android devices?

Following are the steps:
1) Install the add-on on Firefox android.
2) Open a tab with any website (blank page will bring you to settings page otherwise).
3) Click on the three dots and click on Extensions, select my extension
4) Here you'll be able to add/remove website.

Hope this helps

Features
- No ads
- Free to use
- Works offline
- Auto dark mode
- Minimal permissions
- No registration required
- Option to only block the homepage.
- No data collected/stored by the developer.
- Android, Windows, MacOS, ChromeOS and Linux compatible Firefox Add-on.