The support article that covers "FBchat", [[How does Facebook Messenger for Firefox work?]], probably needs to be updated for Firefox Aurora. [http://www.mozilla.org/firefox/aurora/ Firefox Aurora] is a pre-beta test build, which means it's still a "work in progress". I'm not testing it myself. If you don't get a better answer from someone familiar with Aurora, here is a bug report I found on the Social API sidebar, in case it helps: *[https://bugzilla.mozilla.org/show_bug.cgi?id=960198 Bug 960198] - No obvious option to unhide SocialAPI sidebar Here are the Aurora release notes, which link to more information about the new Firefox user interface: *http://www.mozilla.org/firefox/29.0a2/auroranotes/