If you read carefully what FF tells you when trying to load connect to secure berlios, you see that the error is caused by a certificate, that uses the same serial number than another certifcate of berlios.
So it's a berlios and not a C::B problem.
But I can connect to svn://svn.berlios.de/codeblocks/trunk and svn+ssh://<user>@svn.berlios.de/svnroot/repos/codeblocks/trunk from my linux box without problems.