Firefox theme

Linux
#1

Hello.
I tried to change the theme of firefox by these configuration files but I did not succeed. The goal is to be able to change the firefox theme via a small script.

Thanks to all those who will take the time to help me.

#2

Could you at least tell me that it is the name of the variable that contains the value that defines the theme of firefox, ie the one that has the values ​​are white, black or auto.

Thanks to all those who will take the time to help me.