zotero/resource/tinymce/css/note-content.css

pre {
	font-family: -moz-fixed;
}

blockquote {
	margin-left: 2em;
}

/* Add quotation marks around blockquote */
blockquote p:not(:empty):before {
	content: '“';
}

blockquote p:not(:empty):last-child:after {
	content: '”';
}