Diggler adds a button next to the location bar which can clear the location bar (much like the one in konqueror) but also drops down a menu with some useful actions such as being able to disable popup windows and navigate to parent directories in urls (handy for ftp operations and nested sites).

note: diggler looks pretty good in modern and classic themes but due to its nature it might need tweaking for other themes. if you think this is the case, raise a bug and attach a screenshot illustrating the problem you are seeing.