Try with anti-malware software listed in this support article: [https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware#w_how-do-i-get-rid-of-malware Troubleshoot Firefox issues caused by malware – How do I get rid of malware?]

Hi, you can also try working through [http://malwaretips.com/blogs/ads-by-local-temperature-removal/ Remove “Ads by Local Temperature” virus (Removal Guide)] by Malware Tips. '''Note that not all removal programs will detect all malware, so you may need to run several or all of them.''' ''If your question is resolved by this or another answer, please take a minute to let us know. Thank you.''