windows 10 - Firefox 55 - how to remove every single search engine? - Super User
How to Remove Search Engines From Chrome
How to Remove Yahoo Search from Chrome | Cybernews
Instructions for removing search engine do not work, "Remove Button" stays grayed out regardless of check marks. Is there another way that actually works? | Firefox Support Forum | Mozilla Support
Unable to change default search engine in Chrome: This setting is enforced by your administrator
Google update lets users remove contact info, explicit images from search | CNN Business
Chromium-based browsers will not let you delete default search engines - gHacks Tech News