Good European browsers and search engines to reccomend? (Privacy-focused and open source ideal)

I currently use Firefox and DuckDuckGo, but I'm thinking about getting a new browser and search engine. Are there any good recommendations. Privacy-focused is non-negotiable, and i would like it to be open source.

I have heard of Ecosia. How exactly do they work? If they truly do help the environment, like they claim, I may look into that. Is there any evidence? Looking into their privacy policy, it doesn't seem too optimal.