As you must be knowing, some of the most popular websites and web services are having hiccups now a days. This time it was reddit.com. Its facing a XSS (cross site scripting) attack. Reddit confirmed in their blog that the attack was due to anomalies in their own code. Basically whats happening is all your previous comments at Reddit is getting replaced by an anomalous message, even if all that you might have done is just hovered over a comment.
Take a look the screenshot of the "evil demon" below :
Some tips to prevent
* Install and use script managers (even stuffs like "No Script" should work). And then, when Firefox asks you that whether you want to stop a script or not, click yes.