Script is played in a different browser

Hi

I record my scrript in FireFox browser. While recording the script, the FF browser is opened and the user actions are recorded. However, when I play the script, the test results window shows that they are executed in a browser that is not supported. Most probably the application is opened in IE6/7.

I have changed the settings from Run-Time Settings->Browser->Browser Emulation but no success.

The user agent string is 

Mozilla/5.0 (Windows; rv:24.0) Gecko/20100101 Firefox/24.0

Any help is highly appreciated.