Please provide the exact domain name for that webmail service, so that one of us can look the login page and view the source code.

Or learn to user the Browser Console and see what error message are captured. https://developer.mozilla.org/en-US/docs/Tools/Browser_Console

That is not a webmail service. Anyway.

abhimanyu@japanaddicts.org

Japanaddicts (japanaddicts.org) is my website. In my domain provider's settings page, along with all those DNS nameserver settings, etc., there was an email service too. I created an email address, and it said I'm done.

It also gave me configurations, like for POP and IMAP, etc. In the end, it said I can also access it through webmail interface. (Here's all the info they gave me: http://pastebin.com/m1FQgb6L ).

Now, my cousin told me about webmails. I, on his laptop (Kali Linux/Google Chrome) opened webmail.japanaddicts.org and it worked. It opened a login page, I logged in, all fine. Just on Firefox (even on version 29), it doesn't open webmail service when I open webmail.japanaddicts.org and opens something else.

I don't believe there's some error or something in the logs that can help you.

If you want to see what is opened, check this: http://i.imgur.com/Qmef9cz.jpg?1

Nothing about that site looks correct. The login page doesn't look like a secure page and that screenshot image is nothing like the webmail services I have ever used.

Let's see what other contributors have to say.

It doesn't open the login page in the first place. There's something wrong with the browser.