https://support.mozilla.org/en-US/kb/add-or-remove-search-engine-firefox https://support.mozilla.org/en-US/kb/add-custom-search-engine-firefox https://support.mozilla.org/en-US/kb/change-your-default-search-settings-firefox Firefox only comes with a list of default search engines which can vary a bit depending on the language locale. You can add just about any search engine you want to Firefox as there a lot of options at https://mycroftproject.com/ for example.