How to prevent Firebug 2 from spewing SHA-1 certificate warnings in the console

Recently my local development environment was spewing these messages in the Firebug 2 console :

This site uses a SHA-1 certificate; it is recommended to use certificates with signing algorithms that use hash functions stronger than SHA-1.

Is there a way to remove them?

This is only a problem for my local development site, which obviously I have full change access. SHA-1 warnings on external sites that I can live with.