How to find someone chat history on Facebook

How to find someone chat history on Facebook

1) Login  your fb account.

2) go to "http://www.facebook.com/
click on someone profile

3)  Useing google chrome Right-click  any blank part of page and select "view page source" or alternatively open "view-source:https://www.facebook.com/" in a new tab of your google charome.

4) press ctrl+f and find "InitialChatFriendsList" in source code.

5) Right after this keyword you will see the following:
{"list""100303443483","100027126747","1000150182784",
"1000316478180","1000012130967","1000024602374",",]:}

These numbers are the Facebook ID for  your best friends profile; the first number is the facebook friend profile ID,with whom you mainly chat.

6) To see who is the specific person exist behind a Facebook ID. just copy any Facebook ID and, replace the X's with copied Facebook ID and open it in your google chrome.
http://www.facebook.com/ABCD