I have two copies of a book. One is a hard cover, one is a paper back. The paper back is a few centimetres wider than the hard cover, and it makes that copy annoying to read.

There a certain length that a line can be, with being confusing or annoying to read. The reader mode in most browsers understands this, but for some weird reason reader mode isn't available for http://motherfuckingwebsite.com/, at least in Firefox.