Accessing one paid account on a website for multiple users via portable builds of firefox?

Question

Mozilla Firefox

Good day!
There is a site with paid access to the account
. How to implement the possibility of access for several users to this account at the same time, through the Portable assembly of firefox?
Access is required for the site MPstats.ru or similar.
(For example: there are similar offers on the network, they send a .rar archive that needs to be unpacked to drive C, while it can only be used on 1 device and only to view the site MPstats, ozon, wildberries. They write not to touch any settings, do not log out, do not visit other sites.)
The implementation of such access is interesting.