For anyone that would love to get a little more separation/readability out of comments, download Stylebot for chrome or a custom CSS extension for your browser, then use the CSS I wrote out below to get it to look like my screenshot!

Edit: Been making periodic updates throughout the day, and it's sooo much better now, make sure to use the update code below!

/* ==UserStyle==
@name           LES
@namespace      github.com/openstyles/stylus
@version        1.0.0
@description    A style based on the visuals of RES
@author         Sascha Englert
==/UserStyle== */

@-moz-document domain("feddit.de") {
    div.comment {
        border: 1px solid #ced4da !important;
        
        border-radius: .5rem;
        margin: 10px 0;

    }

    div.comment-node {
        border: none !important;
    }
    
    div.details {
        padding: 0 !important;
    }
    
    div.d-flex {
        justify-content: unset !important; 
    }
    
    button.btn {
        padding: 0 10px;
    }
    
    div.mb-3 {
        margin: 10px 0;
    }
    
    svg.icon.mini-overlay {
        color: #f2f2f2;
        background: #ced4da;
    }
}

div.details.comment-node.py-2.border-top.border-light {
  border-style: solid;
  border-color: #ffffff;
  padding:  10px;
  margin-bottom: 2px;
  background-color: #fafafa;
}

div.d-flex.flex-wrap.align-items-center.text-muted.small {
  border-color: #fafafa;
  background-color: #eeeeee;
  border-style: solid;
  padding:  3px;
  border-radius: .9rem;
}

div.d-none.d-md-block.col-md-4 {
  border-style: solid;
  border-color: #eeeeee;
  background-color: #f5f5f5;
   padding:  9px;
   border-radius: .9rem;
}

div.d-flex.justify-content-between.justify-content-lg-start.flex-wrap.text-muted.font-weight-bold {
  background-color: #fafafa;
  border-color: #fff;
  border-style: solid;
  border-radius: .9rem;
}

div.d-flex.justify-content-start.flex-wrap.text-muted.font-weight-bold.mb-1 {
  border-style: solid;
  border-color: #f5f5f5;
     padding:  2px;
   border-radius: .9rem;
}

nav.navbar.navbar-expand-md.navbar-light.shadow-sm.p-0.px-3 {
  background-color: #eeeeee;
  border-color: #fafafa;
  border-style: none;
}

div.md-div {
   padding:  4px;
}

div div p {
  font-size: 14px; 
}

div.comments {
  padding-left: 20px;
  padding-bottom:  5px;
}