Britney Spears the pop icon may have come and gone, but Britney Spears the malware magnet is alive and well.  A group of Russian hackers — possibly working at the behest of the Russian government — has been distributing a malicious Firefox extension, which can draft compromised computers into a botnet. The twist: The command-and-control server pulling the strings of the infected machines is hidden in plain sight, right on Britney Spears's Instagram page. Talk about being a Slave 4 U.