New trojan targets Firefox, masquerades as Greasemonkey
Firefox's broad support for plug-ins and extensions has always been a major feature of the browser, particularly back in the days of IE6. The the browser's enduring popularity has finally caught the eye of malware authors, as a trojan is now targeting Firefox specifically
BitDefender has identified this new bit of holiday cheer as Trojan.PWS.ChromeInject.A" (the ChromeInject suffix refers to the Chrome component of Firefox). The trojan installs itself into Firefox's add-on directory, registers itself as Greasemonkey, and begins searching your hard drive for passwords, login details, your World of WarCraft account information, and your library card number.
Please note, this trojan is not actually the Greasemonkey add-on, and only identifies itself as such. Mozilla has confirmed that the official Greasemonkey release contained within Mozilla's own extension repository (and available here) is malware-free. If you're currently using Greasemonkey or are interested in doing so, there's no reason to avoid the legitimate add-on at this time, so long as you download it from Mozilla's page or an equally trusted source.