There is a default database, but it can be edited by going to the addon options.

Suggest changes to the default database by filing an issue at: https://github.com/stefansundin/the-onion-notifier

To stop notifications for the duckduckgo search engine, consider installing this search engine that directly uses DDG's onion domain: https://addons.mozilla.org/firefox/addon/ddg-onion/

Install

• License: GNU General Public License v3.0 or later
• Weekly downloads: 2
• Average daily users: 28
• Rating: 5/5 of 1 ratings
• Created: 2017-05-22 03:00:14
• Last updated: 2017-05-22 11:42:10
• Homepage: https://github.com/stefansundin/the-onion-notifier
• Support site and email
• Donate
• Orig: https://addons.mozilla.org/en-US/firefox/addon/the-onion-notifier/
• API: the-tor-notifier@firefox.stefansundin.com