Congrats tgparker2011, Welcome back to building.
Not sure which project you are using to build your Win10PE SE???
Most projects have Driver Integration Plugin, use that for Driver Installs.
You mighty want to see if the driver even installs and works in your running Win10PE SE.
PirateBrowser is a portable version of Firefox.
https://portableapps.com/node/58825You could use it portable, or maybe replace the Firefox.exe in the firefox plugin.
And the other apps that you want to add, look for a portable app first,
that way you don't have to build it into the PE.
Also see if your other apps will even run in your PE before trying to build them in.
Regards
RoyM