Even in safe mode, I cannot make a change to my default search engine stick; it always reverts to DuckDuckGo. After changing the default search engine in Preferences->Search to, say, Ecosia Search, typing a space character in the address+search bar goes from a generic world favicon to DuckDuckGo. Restarting with a cleared cache doesn't help. None of my addons are related to search except Ecosia Search. Even with Ecosia Search removed, I get the same behavior, the default search engine reverts to DuckDuckGo. In any case, safe mode with all addons disabled doesn't change that behavior. If i remove DuckDuckGo from the list of search engines, I cannot search at all and I cannot choose a default search enigne from the drop down list in Preferences->Search. Note that I can always choose an alternate search engine in the drop down search menu, and that works. Setting a default search engine doesn't work. Any suggestions on how to make a search engine other than DuckDuckGo be my default search engine would be appreciated. As a bonus, an explanation of why I'm having this difficulty would be wonderful. TIA.