Unable to Login to Facebook, Cookies Required (Postbox 3 and earlier)

If cookies are disabled, you will be unable to login to facebook.  You'll see an error like:

Cookies Required
Cookies are not enabled on your browser. Please adjust this in your security preferences before continuing.

To enable cookies:

  • Preferences / Advanced / Config Editor on the Mac or Tools / Options / Advanced / Config Editor (on Windows)
  • type in: network.cookie.cookieBehavior
  • set the value to 0
  • and restart Postbox.