how can i access a site that has an SSL_ERROR_WEAK_SERVER_EPHEMERAL_DH_KEY

I have a website/server that is internal to our network and I know is secure. It gives me the error message SSL_ERROR_WEAK_SERVER_EPHEMERAL_DH_KEY. When I use Google Chrome, it allows me to go to the site but their browser doesn't run all the java features for the application. How can I get mozilla to connect to the site. It makes no sense that you would prevent users from going to a site that they know is valid and safe.