It also automagically displays the text of the article in one page, despite the obnoxious effort of a site to require you to click through to multiple pages to read a single article.
As far as I can tell, the point of splitting an article into more than one page was just more ad exposure. So it's a double whammy: graying out and background the ads, and decreasing the number of ad-ridden pages one needs to read the article. Awesome in my book.