OpenFire + FastPath WebChat - Pre Fill the User Chat Window with ongoing Conversation

Currently I am using Olark for live chat on my website.
I am planning to replace it with an in house OpenFire installation.
However, there is one problem.

With Olark live chat snippet (which I embed on my website) - if a user opens the website in multiple tabs - it’s prefilled with the ongoing conversation. For e.g. - you can try it on (moonclerk.com).

How do I achieve the same pre population of chat window with the ongoing conversation with OpenFire + FP WebChat?