Updated on June 4, 2021 by Andrew Smith
Microsoft has issued a warning that a new piece of malware called JS/Febipos.A is making its rounds disguising itself as a Chrome extension and Firefox add-on. The malware monitors whether your computer is logged into a Facebook account, if your computer has an account logged in it can perform a variety of actions such as, commenting on a post, liking a page, sharing, posting, joining a group, chatting with the your friends, and posting messages on your page with links to other pages.
http://blogs.technet.com/b/mmpc/archive/2013/05/10/browser-extension-hijacks-facebook-profiles.aspx
If you notice odd behavior coming from your facebook account (comments and likes you didn’t make etc.) It would be advisable to run a security scan with your anti-virus software (or use one of the security tools mentioned below). Then reset your password.
This malware can be removed with Malwarebytes, Microsoft’s secuirty essentials, and most other major anti-virus programs.