Firefox ESR (vanilla Debian package) removed custom search engine
"This is the first time this happened on the vanilla Debian Firefox package: Firefox just informed me that it has changed my default search engine. When clicking on "Learn more", a website informs me that:"
"From time to time, Mozilla may update the list of search engines that are available in Firefox or set as default in specific regions. If your default search engine is changed, you'll receive a notification in Firefox so you can further customize your default search settings."
