how can I apply a CSS stylesheet to all page views in my Firefox browser

Question

I would like to apply a CSS stylesheet to all page views in a Firefox browser using a menu option and be able to toggle this when required. (The functionality I want exists in IE: Tools | Internet Options | Accessibility | Format Documents Using my Stylesheet (although I think this may affect pages outside of simply IE).

Answer 1

you can use Stylish, you can define global styles in firefox and ability to switch it on and off fast from Firefox.

Usage page.

Global styles, you can see code and how it is done.

Answer 2

You could use the file userContent.css lying within the directory named chrome in your Mozilla Firefox profiles directory. There is also an example file named userContent-example.css.

Answer 3

There is another Firefox addon called Platypus which which adds a toolbar for editing site styles. It does require you to install Grease Monkey.

I just installed Stylish and my first impression is that is nicer than Platypus, especially when it comes to sharing your styles with others. But I'll reverse my judgment as to which I think is better when I have more time to compare them. :)