Thank you for replying. The next morning when I started up Opera again, Duck Duck Go was the default search engine. Not sure what happened, as I had tried many things -- relaunching in safe mode, switching to Google (Opera's default) and then back to Duck Duck Go, closing Opera and re-opening, etc.... but it's all working fine now.
Sorry, but how do you actually turn this on?
I installed Tampermonkey and copied the script in and the dashboard says it's enabled, but Tampermonkey says no scripts are running and a search on DuckDuckGo just searches on DuckDuckGo.
For this to happen, both Opera and Ecosia need to want it, and it has to be profitable for both.
So did you already contacted Ecosia? What they say about it? Di dthey already try an agreement with Opera?
Google doesn't separate search results that much anymore - like they used to do for different language areas. Sure China still get's the treatment. If Opera continues to be the only browser with forced default engine ~ step 1 would add option to choose a country code (ccTLD) from a short list including .com!