Your facebook account keep posting bad links unwillingly?

Recently some of my friends got trouble with their facebook accounts.
Their facebook account keep posting bad links which will infect other people via visiting the website and get the extensions or plug-ins. The url will like bit.ly or something.
For my curiosity I found one of them and try to simulate the way it infects my friends and found some solutions.
I'm not sure this will work all the time. But I wish this could help somebody to help themselves.
The dangerous website is xxx.(Sorry I have to hide it, similar post just deleted by facebook) It will popup a dialog and ask you to download a plug-in if you're using Firefox, a extension if you're using Chrome. As of IE you won't be affected by IE.


And follow this instruction to cure your Firefox or Chrome.


In Chrome >  Tools > Extensions > Remove "Google Chrome Extension" "You Tube Speed UP!"


In FireFox > Tools > Add-ons > Extensions > Disable "Firefox Extension Updates 1.0.0" "You Tube Speed UP!" 


Good luck!