If you're a fan of reading long articles online (such as from Long Form) or just read a lot of different things on your web browser, I recommend checking out the excellent Readability plugin. Here's how Readability in Google Chrome renders this Atlantic article on parallels between mutations in genetic code and mutations in the text of hand-copied ancient manuscripts. The default version of the article:
Readability version of the article, with ads and other distractions removed, larger font, and more pleasing background color:
You can customize your settings, including font, font size, background color, and width of the text body. Check it out.