Currently my search engine and url is set on Google Chrome, how do I change it and make Firefox, Mozillamy default?

Mozilla Firefox and Google Chrome are web browsers and not search engine sites. A search engine is for example qwant.com, duckduckgo.com, google.com, bing.com etc. To change or install another search engine in the Firefox for Android web browser see https://support.mozilla.org/en-US/kb/manage-my-default-search-engines-firefox-android If you want to make Firefox the default web browser on Android then see https://support.mozilla.org/en-US/kb/make-firefox-default-browser-android