Open Pet Society
Open cheat engine & set it as follows:

Choose firefox from the Process list
Tick hex & paste (840FFF85C12A0FF2)
Tick Also Scan Read memory
Go & Buy an apple (or anything it doesn't really matters)
Click on cheat Engine First Scan
You will get 4 addresses
Go to the 4th address right click & choose (disassemble this memory region)
Right Click on cvtsi2d xmm0,xmm1 & choose (Toggle breakpoint)
Buy another apple
It will freeze (don't panic)
Go back to cheat engine & change ECX value to 99999 (in my case read the note below to know what should value should u enter)
Click F9 or Debug run
Voila Save

Note:
level 1-29 you can type 99999
level 30 and above type 9999 (less info)