URLs are used quite heavily by some to point others to some interesting material. Some URLs end with a anchor. That is a specific point on the page that is to be displayed. For example, a long Webpage may be divided into four sections, and the person referring it to you may wish to point out section three (on, say, poodles).
The URL could be http://www.example.com/dogbreeds.html#poodles or something similar. If given just http://www.example.com/dogbreeds.html, you would see the start of the article. With the anchor, presumably, you would see the article displayed at the start of the section on poodles.
Unfortunately for me, I just noticed that when Firefox (version 28.0) loads a Webpage, it does not display at the anchor point but only the beginning. If I reload, the same behaviour occurs again. If I click on the address and then press [Enter], only then do I see the article positioned at the anchor point.
I wonder how many times I have given up on a Webpage referred to me, because I thought it did not have the content I wanted.