The netbook initially had Win8

The Porteus Kiosk is an excellent solution for this netbook and is notability faster than ChromeOS.
My present problem is trying to find a way to install (and configure) Firefox extensions, namely AdBlockPlus and Ghostery for bandwidth control and privacy respectively.
A brief search turned up a few threads 4-6 years old and I wasn't sure if they were still valid.
Secondary question:
Is there a particular configuration of Mram, swap files, etc that I should consider with 16GB internal SSD and 2 GB of RAM that would be optimal for this system?
Sorry about the really newb questions. This system is a little different than I'm used to and I'll need time to adjust.
It also seems like a configure and forget system, which I REALLY like.
Sincerely
CE