The second beta version of Firefox 3.6 has arrived, following hot on the furry little heels of 3.6b1, which was only a week and a half old. Mozilla's touting a whopping 190 bug fixes in that time, many of them user-submitted. If you're using an older version of 3.6, you should definitely update.

In my personal experience with 3.6, I've found that most of my themes and several of my add-ons (including the essential Greasemonkey) haven't been updated yet. On the whole, however, it feels very fast (especially at startup) and has proven very stable.

All the major upgrades came in 3.6b1, but if you're using Firefox 3 or 3.5, here's what might entice you to give 3.6 a shot: it offers faster Javascript performance and startup time, built-in support for the Personas one-click theming system, full-screen video and poster frames. If you want to wait for the final version of 3.6, you'll be pleased to hear it's scheduled for December. If the quick turnaround on Beta 2 is any indication, Mozilla is back on track to make that deadline.