Firefox's Reader View, with custom userContent.css to fix the unnecessarily low contrast: @-moz-document url-prefix("about:reader") { body { backgr

Firefox's Reader View, with custom userContent.css to fix the unnecessarily low contrast: @-moz-document url-prefix("about:reader") { body { background-color: #FFFFFF !important; color: #000000 !important; } } In recent versions of Firefox this requires toolkit.legacyUserProfileCustomizations.stylesheets to be set to true in about:config The most legible style is the style you're most familiar with, so "design" is almost always a negative. I don't care about your unique branding.