I also wonder if they even tested it on slow connections. Firefox 5 has hung at least once a day (every about 5 hours of browsing time) and forced me to stop a

I also wonder if they even tested it on slow connections. Firefox 5 has hung at least once a day (every about 5 hours of browsing time) and forced me to stop and reload the current page to finish downloading it. That was very, very rare on FF3.