Mozilla has just released Firefox 12 to the release channel, six weeks after Firefox 11. Version 12's chief addition to the browser is a new auto-updater for Windows users, which no longer requires administrative privileges to install updates - you'll be prompted once by the UAC the first time you install Firefox, and the browser will update silently after that. If you still want to be notified before updating, you can revert to the old behavior by unchecking "Use a background service to install updates" in Firefox's update preferences. The new auto-updater appears to be a Windows-only change, at least for now; the updater's behavior is unchanged in OS X and Linux. The other major user-facing change is in Firefox's developer tools, which Mozilla claims...