The Firefox 6 browser and Thunderbird 6 email app are both out now, and if it seems like just yesterday that you were reading about Firefox 5 — no, it's not your imagination. Both releases are part of Mozilla's new rapid release strategy, which means there are fewer new features in each version, but hopefully less breakage as well. In this case, Web developers get some new tools on the browser front, but Mozilla still has major problems to iron out of the new release approach.