It would also be handy to have some visual guides for the indentation levels of nested comments as on Reddit. I've hacked my own indentation marks using a CSS injection for now, but this is clearly still not optimal:
@-moz-document url-prefix(https://news.ycombinator.com/) {
td { vertical-align: top }
td > img { background: repeating-linear-gradient(to right, rgba(0,0,0,0), rgba(0,0,0,0) 38px, rgba(0,0,0,0.3) 38px, rgba(0,0,0,0.3) 40px); margin-top: 4px; height: 12px!important; }
div.votearrow { padding-bottom: 3px; background: url('http://localhost/uparrow.png') !important; background-size: 12px 20px !important; width: 12px!important;}
}
I've also increased the size of the voting arrow because it's just uncomfortably small. By Fitt's law [0], smaller buttons require more time and effort to click!