From:  Boris Zbarsky <bzbarsky@mit.edu>
Date:  10 Sep 2005 02:27:08 Hong Kong Time
Newsgroup:  news.mozilla.org/netscape.public.mozilla.layout
Subject:  

Re: Dark Text Box

NNTP-Posting-Host:  adsl-69-209-193-158.dsl.chcgil.ameritech.net

Andre Janssen wrote:
> Fine. But I don't have a file like this. Where do I have to create it and
> what have I to write into it?


http://www.google.com/search?q=userContent.css&start=0&start=0&ie=utf-8&oe=utf-8&client=mozilla&rls=org.mozilla:en-US:unofficial

The first hit seems to be about what you want.

And you write whatever CSS rules you feel like.

-Boris