showdead is essential for Orange Reddit but it will show downvoted comments in unreadable light grey on light grey. So you probably want a user 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; }