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There are many addon,widgets which claim to get your old facebook chat, but none of them worked for me. I searched and found to better solution for this.
Steps:
1. Log in to facebook
2. Open the following Chat link
Facebook Old chat box
Or copy the following link and paste in your browsers.
Or copy the following link and paste in your browsers.
https://www.facebook.com/presence/popout.php
3.Enjoy the chat with your friends.
Update: This url is not working anymore. Seems like a facebook don't want us to chat in window which does't show any ads.

There are many addon,widgets which claim to get your old facebook chat, but none of them worked for me. I searched and found to better solution for this.
Steps:
1. Log in to facebook
2. Open the following Chat link
Facebook Old chat box
Or copy the following link and paste in your browsers.
Or copy the following link and paste in your browsers.
https://www.facebook.com/presence/popout.php
3.Enjoy the chat with your friends.
Update: This url is not working anymore. Seems like a facebook don't want us to chat in window which does't show any ads.