MXML little issue

Hello !

I have set up an Asterisk 1.8.4 on a Debian Virtual Machine. Then, I have activate the AMI.
From Firefox, I can login with the following URL :

It display :

      <response type="object" id="unknown">
                <generic response="Success" message="Already authenticated"/>

So it work. However, when I get to the URL from another web browser, it does not work anymore. It just say that :
[code]This page contains the following errors:
error on line 4 at column 29: expected '>'
Below is a rendering of the page up to the first error.

When I get into the asterisk with verbose mode, it said that the user is connected. So, it is not an important issue but I want it to be resolved. Any idea ?

Thanks in advanced for the help you could provide me.

Best regards, Philippe.