You can access the XFox Live sidebar by clicking the status bar icon in the lower right. If you are using Firefox 4, it is in the lower left and you can move this icon to wherever you like.
To import your friends, go to the Xbox Live Friend Center. Then right click on the icon and select “Import.”
You can also add your friends manually by right clicking on the XFox Live icon and clicking “Add Friend.”
Unfortunately, XFox Live no longer shows the online status of your friends. This API is no longer available.