I'm now using Firefox 31.
I'm connected on many stackexchange web servers with the same login method. Unfortunately I can't connect within the exact same session, with the same browser, and with the same authentication method on:
When I click here:
nothing happens. Moreover, if I open Firebug console, I can see (only on the authentication window from math.stackexchange.com), the following error message:
How may I investigate any further this security error detected within Firefox and this web server?