I logged on to that site and my Security software alerted me to the following.

11:47:27 Firefox Denied: HEUR:Trojan.Script.Iframer

and

Firefox Denied: Exploit.JS.Pdfka.ec

An Exploit is software or code that targets security vulnerabilities, usually in the operating system or browser, but may also target vulnerabilities in other programs. Exploits are typically used to install malicious software on the victim's computer without the victim's knowledge or consent. An Exploit may be used to install malware that gives the attacker complete access to and control of the affected computer from a remote location.

update.More here on that threat.
Sun Java JDK / JRE Multiple Vulnerabilities