The XPath section in the Web Inspector is terrible as it stands now. It shows this massive selector path for many of the typical elements inspected from the root, and it just looks awful visually. I don't want to get into a religious debate about XPath vs. CSS selectors, but realize that for your typical Web developer, displaying the XPath selector is essentially useless information. My recommendation would be to remove this or to shunt it into some sort of geekier details pane that doesn't show by default.
Created attachment 9314 [details] Removes the XPath section
Comment on attachment 9314 [details] Removes the XPath section r=me
Landed in r15271