Google+Facebook allows you to view your Facebook stream in Google+
I opened the code, decided to make a few comments. If you want to read my findings (might be a bit technical), go ahead. But I'm just going to make this clear: DO NOT INSTALL THIS. This addon acts like malware and the service is a security vulnerability waiting to happen.
If you did install this accidentally, read the child replies to this post, there are instructions on how to remove this provided by several people.
The following notes were from the Firefox version of this addon (which I was able to get by looking at the script on the install page), but I'm sure the Chrome version pulls off similar ploys.
http://www.reddit.com/r/technology/comments/ikymu/googlefacebook_allows_you_to_view_your_facebook/c24mfci
Do not install Google+Facebook extension and if you have, click the link above to see how to remove it.