@namespace url(http://www.w3.org/1999/xhtml);

@-moz-document domain("mail.google.com") {
tr.rr td { padding-top: 0.3em !important; padding-bottom: 0.3em !important; } 
tr.ur td { padding-top: 0.3em !important; padding-bottom: 0.3em !important; } 
table.N2mZ7b tr td { padding-top: 0.3em !important; padding-bottom: 0.3em !important; }
}