Did you already try use Reset Search? *https://addons.mozilla.org/pt-BR/firefox/addon/searchreset/ And, did chceck if it is in your addons or plugins, or is amalware? *[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Firefox in safe mode] *[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware Problems caused by malwares] Did you try reset Firefox? *[https://support.mozilla.org/en-US/kb/reset-firefox-easily-fix-most-problems Reset Firefox] Also check if it is installed in your PC, go to your Control Painel and see the programs installed Also: *[https://support.mozilla.org/en-US/kb/search-bar-easily-choose-your-search-engine Manage Search Engines]

THANK YOU SO MUCH - HAD TRIED FOR AGES BEFORE

[https://support.norton.com/sp/en/us/home/current/solutions/v96233795_EndUserProfile_en_us Conduit removal instructions] from Norton, In this page you can find steps to remove this toolbar from Firefox and other browsers.