Firefox is regarded by many as the most efficient internet browser due to its list of features, speed and reliability. Some time ago when Firefox 3.0 has been announced and many internet users have been observing how the new browser version is going to perform. At the time of planned release, it seems that Mozilla has identified 10 high-priority bugs, out of which 3 are considered critical. While this might sound quite serious, Mozilla did correct the problems and in a timely manner and released a version which did not suffer from such problems. Besides the bugs, Firefox 3.0 looks like a very stable version of Firefox ever and the list of new features is quite long. This example just shows that even very good and popular Web browsers can still be buggy at some point of time.