Friend,
you should download and use the following FREE anti-malware:
1. Malwarebytes Anti-Malware
2. SUPERAntiSpyware Free Edition
You can google search for these items, and DL for free. They are very helpful.
When I got a trojan horse virus on my home cpu, it removed it as well as other malicious items.
GL!
Also, I switched from Firefox to Chrome.