Some inline ads (those that select a few words from the webpage and link them to an ad) can't be removed by Adblock. This CSS doesn't exactly remove it but it hides the tooltip pictures of those links and changes the styles of the link to look like normal text. Although if you roll your mouse over it, it's still a link, just that you can't really tell anymore and you won't see the tooltip ads. Makes a page look much cleaner.