Being a Firefox user for more than 3 years, I had been telling fella peers to adopt the rocking cool browser and praising it for its ease of use, fast and secure features.
But... not until NOW!! It is not a new feature of Firefox, but just a dump user like me which is too used to IE years back, I've discovered the Error Console feature of FireFox. See it for yourself, I trust the these 2 screen shots speaks it all that you need to know about the feature.
Again, Firefox Rocks Rocks Rocks!