`+ tr` selects the sibling tr element to the matched element. The HTML on the page uses three tr's per post. The first (with class "athing") contains the title.

`+ tr` selects the sibling tr element to the matched element. The HTML on the page uses three tr's per post. The first (with class "athing") contains the title. The second contains the post karma, submitter name, comments link. The third is a spacer. So you'd want to block all three.