Troj/Agent-FF is a proxy Trojan for the Windows platform.
When run Troj/Agent-FF drops a helper component browseti.dll into the Windows system folder and creates the following registry entry so as to auto-start:
HKCR\CLSID\{E6FB5E20-DE35-11CF-9C87-00AA005127ED}\InProcServer32
(default)
<Windows system folder >\browseti.dll