does Firefox honor local self-signed CAs ?

[lejeczek]

Hi guys

I put my own CAs certs into: /etc/pki/ca-trust/source/anchors
then _update-ca-trust_
My other web-browsers seem happy but Firefox always 
shows/warns: connection not secure
as oppose to other browsers saying: is secure

Something has changed in default behavior - I remember 
Firefox did not do it - even if it was possible to "tweak" 
Firefox back to "normal"

would you know?
thanks, L.