Mozilla sent Firefox Version 24.0 to the release channel. Version 24.0 includes seventeen security updates of which seven are critical, four high, and six moderate. It is advised that this update be installed ASAP.
To get the update now, select "Help" from the Firefox menu at the upper left of the browser window, then pick "About Firefox." Mac users need to select "About Firefox" from the Firefox menu.
Additional information about the update is available in my blog post here