"If you look at this link: (http://www.w3.org/TR/REC-CSS1),
you'll find a section that talks about a User Agent. This is
another way of referring to your browser. CSS specifies that all
User Agents should have a default style sheet that displays
elements in some routine manner, which can act as a basis for
displaying web content."
"Mozilla takes this concept of a User Agent a step further
and allows a style sheet for each profile you use. ... Before
I go into some detail as to how to set up and use user style
sheets, I'd like to take a moment and give you some idea as to what
they can do. ... User style sheets give you a centralized way
to try out new style rules -- without even knowing where in the
world that visual element is stored, or even if it's XUL or HTML
that is affected. Here are some examples:
Force all links on web pages to be underlined, even if the site
author styled them differently.
Shrink all images to 10X10 pixels until you move your mouse
over them (a simple "banner ad filter").
Cause Mozilla's drop-down menus to be semi-transparent -- like
Apple's OS X.
Change the background color of your Mozilla chrome.
Test out potential skin changes without having to create a new
Test out XBL changes without having to edit existing XBL
Share company-wide style information within a work-group (make
the browser look similar to everyone in that group).
Change the "throbber" based on which web site you are in.
Debug your XUL code by creating CSS that outline elements you
Create a remote style sheet on a server and inherit it on
multiple browsers (using @import).
Create your own look and feel for any web site you wish!"
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