Firefox Custom Stylesheets
Petr Rehor

Copy-and-paste this stylesheets to your userContent.css file.

GMAIL

Change default font to Verdana and display message body with monospace font:

@-moz-document domain(mail.google.com)
{
    body,td,input,textarea,select,button {
	font-family:verdana,arial,sans-serif !important;
    }

    button {
	font-size: 100% !important;
    }

    .mb {
	font-family: monospace !important;
	font-size: 110% !important;
    }

    .tb {
	font-family: monospace !important;
	font-size: 140% !important;
    }
}

[1] Fixed width font in Gmail
[2] Per-site user stylesheet rules

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