Save chat messages of Facebook like Gmail or yahoo with free chat history manager, available for Firefox and Chrome browsers as addon/extension.So what does it do  and how to use it is pretty simple.You can view your chat history anytime either online or offline.
Your messages are securely stored and only person passed the security check can view saved messages.Note that all messages are stored in your client, this application won’t store your chat history on server.
Installation and usages are pretty simple.
1.Create your account.(Required)
From Firefox menubar, select Tools,find Facebook Chat History Managermenu, and select Create Account.
To Get Facebook ID, From Tools->Facebook Chat History Manger, select “Get Facebook ID”, then login to facebook to get your facebook ID.
2.Change your account.
From Firefox menubar, select Tools,find Facebook Chat History Managermenu, and select Change Account. 3.View chat history.
Online: view this page and click View Chat History, Offline: a.Press Controll+Alt+F to open chat history window. This need you login.
b.From Firefox menubar, select Tools,find Facebook Chat History Managermenu, and select View History.
4.Set Preference.
Set messages per page: From Firefox Tools menu,select Add-ons,find Facebook Chat History Manager and select Options.

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