The software is called Adobe Flash Player extension for Firefox; the silently installed third-party tool is McAfee Security Scan Plus. That's it -- having installed a minor extension to a browser, you get a system-wide
Leaving aside the moral and legislative aspects of such scheme (and please don't say it's just business -- similar schemes were neglected even by Russian gangsters in 1990ths), just wish to warn you to be careful with these. Nobody knows what exactly information collects and sends out the installed tool, neither what is the purpose of collecting such information.