Try this utility:

• http://technet.microsoft.com/en-us/sysinternals/bb897437.aspx

IP addresses that downloads come from are, 85.17.172.87 95.211.185.133 95.211.185.137

Believe these are associated with FileFactory.

I download and upload to Filefactory.

Is firefox trying to redownload files, or aborted files?

This is definitely being downloaded with Firefox.

Site logged into makes no difference.

Close Firefox and the download stops.

Tried going back to v12 and problem still occurring.

If no results soon I'll be abandoning Firefox.

please try to reset firefox (this will keep your bookmarks and passwords) and do a full scan of your system with different security tools.

Refresh Firefox - reset add-ons and settings

Troubleshoot Firefox issues caused by malware

malware is not a problem, been checked hunted to death....

have un-installed firefox with 'your unin-staller'

reloaded latest version.

will see how it goes from here.

Still working fine.

Mark as solved.