This extension simply provides a small browser window for accessing the hangouts site. While not really useful, I suppose it works. HOWEVER, the reason I'm giving this 1 star is that it has insane permissions to track all your browsing and data across Firefox. If you install this, you are giving the author permission to "read the content of any web page you visit as well as data you enter into those web pages, such as usernames and passwords." If this is a legitimate add-on, the author really needs to change these permissions.