Secure Connection Failed
   An error occurred during a connection to www.yahoo.com.

   Certificate contains unknown critical extension.
   (Error code: sec_error_unknown_critical_extension)

Worked find before today, upgraded to 30.0 recently (yesterday, 6/12/14?). Now all google.com and yahoo.com urls fail on firefox (ffx) with error: Secure Connection Failed An error occurred during a connection to www.yahoo.com. or " " www.google.com. or " " accounts.google.com Certificate contains unknown critical extension. (Error code: sec_error_unknown_critical_extension) Problem websites accessible from IE. Tried remove/replace ffx in win7 firewall, no help (NH). Tried clear cache & cookies, NH. All worked fine yesterday -- may not have tried after upgrade to 30.0. Similar environment on win7 home premium x64 laptop with shared ffx sync settings currently works ok.