I get this when I open that link in Firefox 29.0.1:

  Secure Connection Failed

  An error occurred during a connection to lavabit.com. 
  Peer's Certificate has been revoked. 
  (Error code: sec_error_revoked_certificate)

And there is no way to override it or make an exception.

another way that works out of the box is to use a text-only browser like w3m :)