Some user are getting some errors with a cached this ssl certificate. This is not problem that may be fixed on server side. Users to clean ssl cache of his system.
Most probably following this guide https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings will solve problem. If not maybe please try contacting your ISP for help about this case.
Brian Wang is a Futurist Thought Leader and a popular Science blogger with 1 million readers per month. His blog Nextbigfuture.com is ranked #1 Science News Blog. It covers many disruptive technology and trends including Space, Robotics, Artificial Intelligence, Medicine, Anti-aging Biotechnology, and Nanotechnology.
Known for identifying cutting edge technologies, he is currently a Co-Founder of a startup and fundraiser for high potential early-stage companies. He is the Head of Research for Allocations for deep technology investments and an Angel Investor at Space Angels.
A frequent speaker at corporations, he has been a TEDx speaker, a Singularity University speaker and guest at numerous interviews for radio and podcasts. He is open to public speaking and advising engagements.