I am trying to configure nixos' firefox to use adobe flash.
I am well aware of the issues of adobe flash; I "need" it (on one specific host) because of school games played by my son.
It is clear that nixos' firefox is intended to be able to use adobeFlash; the package is set to be configurable here. However, despite searching in the nixos manual, even an oblique reference here and various other websearches, I cannot find how to pass the required configuration to firefox.
Any help much appreciated.