In some situations I am using the browser to read JSON or XML output provided by some of our backend systems. So far, in FF or Chrom[e|ium], there are modestly usable extensions to render JSON and unformatted XML in a somewhat meaningful way. Maybe rekonq could be extended in a similar way, i.e. by including some external application (kate? ...?) to display the actual content read-only? Guess KDEs infrastructure, here, offers for mechanisms far more sophisticated than just browser add-ins. ;)