Visualize the length of the article you're reading on the vertical scrollbar, so you know how long is it relative to comments
Do you want to know how long is the article you are reading? You can tell by a look at the scrollbar, that the website is very long, but how much of it is taken by comments below the article? This extension displays a red indicator along the vertical scrollbar. The length of the red bar corresponds to the length of the article. This lets you immediately understand how long is the article.