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.

Mozilla doesn't make any virus cleaners, but this article lists programs other Firefox users have found helpful. It also lists specialized forums where you can be led step-by-step through the process.

Troubleshoot Firefox issues caused by malware

Let us know how those work for you.