Originally posted by JuggernautSE:

https://test.bankid.com/ is stuck in "Checking your version of BankID Security Application...", same site in Chrome/IE works fine.

Well ...

BankID Security Application can not be installed.

yOUR PLATFORM Linux 64-bit is not supported. You find information about supported platforms here.

I wouldn't trust that thing at all. And I cannot find out what is supposed to be installed.