Hi, if You have been going to 3 Bar Menu --> Options --> Search Clicking on Bing and removing it https://support.mozilla.org/en-US/kb/add-or-remove-search-engine-firefox and it keeps coming back : https://support.mozilla.org/en-US/.../remove-toolbar-has-taken-over-your-firefox-search Or you have some malware : *https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware Save your Report and google each before deleting anything as do not want to delete something you need, If need help : *https://forums.malwarebytes.com/topic/9573-im-infected-what-do-i-do-now/ Uninstall any Bittorrent apps, uninstall cracked programs and delete cracks then Post in only 1 forum, then wait. Please let us know if this solved your issue or if need further assistance.