action not allowed on form validation

Yes I know, strange right?

It is not possible, i am using the same views and the same controller as here: https://ellislab.com/codeigniter/user-gu...ation.html. Source is as it is supposed to be. Yesterday I MAYBE actually found the problem: I try to run this code on Chrome 39 and on IE 8. It works on both. But on Firefox 34 it never works. I dont know why i haven't tested this earlier.

So apparently something is wrong with firefox 34? I googled about it but i didn't find anything.
Then I ran some more tests on what is happening with csrf_hash. I put log_message('info', $this->security->get_csrf_hash()); in controller. And i found out that when i refresh (run) controller in Chrome, csrf_hash does not change, it is changed just when i submit form and post is sent back to controller. In firefox csrf_hash is changed every time when controller runs.

In Log file, when i submit my form in fireofx, the last log is [DEBUG - 2014-12-10 12:45:50 --> Input Class Initialized], next one would have to be [DEBUG - 2014-12-10 12:45:50 --> CRSF cookie Set] but it never came to that. So I suppose that on form submition in firefox, crsf cookie don't want to be set. Why in firefox but not in IE and Chrome? It's weird.