showdead is essential for Orange Reddit but it will show downvoted comments in unreadable light grey on light grey. So you probably want an users CSS (e.g., with Stylus) like this (italic and the particular color are to taste, of course):

    .c5a, .c73, .c82, .c88, .c9c, .cae, .cbe, .cce, .cdd { color: #222; font-style: italic; }