You should have protection from them with Mcafee and adblock. Switch to : https://addons.mozilla.org/en-US/firefox/addon/ublock-origin/ https://addons.mozilla.org/en-US/firefox/addon/ghostery/ 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.

Your system details show an extension called 'MapsTrek 1.0.101', which is not on the official Mozilla Add-ons page ..... Unless you installed this extensions yourself from some other site, please remove it, as it seems to be malware.