Hi, do you have a add-on that is doing this ? Please check your Options --> Add-ons for such and disable it or uninstall it if possible, also please check Programs and Features for anything that is in there that may cause this as well any programs you have installed since this started. Remove them. Also please use more than 1 scanner as each uses diff tech : *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/ Post in only 1 forum, then wait. Please let us know if this solved your issue or if need further assistance.