I found this solution online. There isn't a way to change it back, but you can go to this link and it will basically show all your friends like in th old version. It's a nuisance but i guess its the only way for now. Go on this link while on facebook:http://www.facebook.com/presence/popout....
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Here it is, install this an restart firefox. If you use other web browser you have a solution for them too, just scroll under on the same link. Link is:
https://addons.mozilla.org/en-US/firefox/addon/fb-chat-sidebar-disabler/
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