follow this steps ;
This is how you can get your old facebook chatbox back!
- Firstly click this link >> [link] (don't worry this is not the "hi, how are you?" virus)
- Then it will ask you install or cancel
- Click install
- Then, refresh your Facebook account or close browser and log in your Facebook again
- And then you're done!
*For computer/laptop which has strong malware filter, there might be malware alert.So, its your choice whether to install or not.