Hi there, Firefox is not a search engine so I guess you mean why Firefox is not your default browser? To make it so, please follow the instructions here: https://support.mozilla.org/en-US/kb/make-firefox-your-default-browser

''<p>susanhaley48 [[#question-1553725|said]]</p>'' <blockquote>Why is Firefox no longer my search engine? </blockquote> Mozilla the makers of the Firefox web browsers does not have a search engine of their own. 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