How to connect to the Firefox search engine?

Firefox for Windows, macOS, Linux and mobile versions for iOS/iPadOS and Android is a web browser and not a search engine. A search engine is for example duckduckgo.com. bing.com, google.com etc. See this KB article on how to use search engines in the Firefox for Android web browser. https://support.mozilla.org/en-US/kb/manage-my-default-search-engines-firefox-android