# customize Firefox reader dark mode
Written on July 15, 2022\
Firefox version: 91.0
 
I use this tweek to view a page in reader mode with different colors, I prefer lime on black background. More customization is possible - font, background also for sherif mode. Just make this file in /chrome folder in Firefox profile in use.
 
 
~~~
 /* Customize firefox reader dark profile 
save this as 'userContent.css' file under /chrome folder in current firefox profile.
To find profile open url about:support, check Profile folder*/

@-moz-document url-prefix("about:reader")
{ 
body.dark
  {font-family: "consolas" !important;
	color: lime !important;
    background-color: black !important;	
    }
body.dark.serif
  {font-family: "courier new" !important;				
	color: yellow !important;
    background-color: black !important;
   }
}
~~~
 
## just to make sure

Make sure the below property is true in about:config page

>toolkit.legacyUserProfileCustomizations.stylesheets = true