Default Firefox install has google as one of the search engine. So unless you set your homepage search engine or remove or add one that will be what is uses. This is what is standard default during install. https://support.mozilla.org/en-US/kb/add-or-remove-search-engine-firefox https://support.mozilla.org/en-US/kb/how-to-set-the-home-page It's best advise to set a homepage search engine aka www. google. com or such as to when open or new tab it starts there.