I have had a problem that started with my new PC - running latest Firefox fresh install!
Running Windows 8 - 64 bit machine
This happens for all SSL sites.
As an example:-
When I go yo my banks website I get
Secure Connection Failed -
An error occurred during a connection to http://www.hsbc.co.uk
Peer's certificate has an invalid signature.
(Error code: sec_error_bad_signature)
I went into about:config and enabled browser.xul.error_pages.ex
Still no sucess