My userContent for Thunderbird

userContent.css

/*
 * Get rid of right quoting bar and unnecessary paddings.
 *
 * note: works best with the following settings in prefs.js or (preferrably)
 * user.js
 *
 * user_pref("mail.quoted_graphical", false);
 * user_pref("mail.quoteasblock", false);
 */

blockquote[type=cite] {
padding-bottom: 0 !important;
padding-top: 0 !important;
/* 
 * padding-left: 0 !important;
 * border-left: none !important;
 */
border-right: none !important;
}

/*
 * different colors for up to 5 levels of plain-text quotes
 * you can expand this by adding additional blockquote
 * levels at the bottom, but seriously, 5 levels of quote
 * should be enough. 
 */
blockquote[type=cite] {
	color: navy ! important; 
}
blockquote[type=cite] blockquote {
	color: maroon ! important; 
}
blockquote[type=cite] blockquote blockquote {
	color: green ! important; 
}
blockquote[type=cite] blockquote blockquote blockquote {
	color: purple ! important; 
}
blockquote[type=cite] blockquote blockquote blockquote blockquote {
	color: teal ! important; 
}