I'd like to report that it is impossible to use this forum from Firefox and had several issues registering and using it from IE 11.
Firefox reports: Secure Connection Failed. The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
In I.E. 11, it is useable but there were several times even during the registration process where "This page can’t be displayed" message appeared and i had to refresh it in order to proceed with the process.
Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko