The particulars change, but the general rule doesn't: Don't install software you're not certain you can trust. A new Trojan horse targeting Mac users tries to trick you into installing it by prompting you to install a browser plug-in when you visit a compromised or malicious webpage.Related StoriesNew MacBook Air release date, rumours and leaked imagesApple sneaks Safari update into Snow LeopardWhy you should use Mountain Lion's Spa
