Bug 862543 - Update "exit reader" icon. r=sriram
Bug 871014 - (Part 1) Remove "margins" setting from reader mode menu. r=bnicholson
Bug 871014 - (Part 2) Replace +/- font size setting UI with something more visual. r=bnicholson
Bug 871014 - (Part 3) Represent typeface choices more visually. r=bnicholson