How to back up the history

I have a old Macbook pro 6 years old running Snow Leopard , Firefox 33.1.1. How do I back up my history? And where I can access my history on new Mac computer running a new OS X?

Where is the history stored and how do I back up my history.

firefox 33.1.1
Safari verstion 5.1

I don't get any options under tools or history to back it up.