The Top Urls in your developer tab is a great way to find out at which URLs the error occurred at the highest frequency. This can help pinpoint which parts of the code the issue is occurring on most. As a result this is usually a good place to start when attempting to reproduce an error.
Sometimes we can see errors that only occur on one URL. In these cases you have a very good chance of narrowing down the error. Furthermore, the URLs are listed on the right from the highest count to the lowest count.