I using jQuery Ajax like below:   

```
$.ajax({
url: 'servlet/*****Servlet',
      dataType: "text",
      success: function(data) {
        var subareaCoordsPGs = preprocessCoords(data);
      }
    });

```

it works good even i did not set the dataType in Chrome, however, it failed in FF with XML parsing error.

> 
> Response Headersview source   
>  Server Apache-Coyote/1.1  
> 
>  Transfer-Encoding chunked  
>  Date Tue, 04 Oct 2011 00:08:08 GMT  
> 
>  Request Headersview source  
>  Host localhost:8080  
> 
>  User-Agent Mozilla/5.0 (Windows NT 5.2; WOW64; rv:7.0.1)
>  Gecko/20100101 Firefox/7.0.1  
>  Accept text/plain, */*; q=0.01  
> 
>  Accept-Language en-us,en;q=0.5  
>  Accept-Encoding gzip, deflate  
> 
>  Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7  
> 
>  Connection keep-alive  
>  X-Requested-With XMLHttpRequest  
> 
>  Referer <http://localhost:8080/>*\*/  
>  Cache-Control max-age=0  
> 
> 
> 
> XML Parsing Error: not well-formed Location:
>  moz-nullprincipal:{2f6a8381-b987-448b-88c2-e89c4e13440b} Line Number
>  1, Column 4:  
> 
> 
> 
> 534@151.248078368847 -33.9353900931769,151.247877472978
>  -33.9360784582012,151.24...  
> 
>  ------^
> 
> 
> 

after searched, i know it is good to set the proper data type, i want it to be parsed just as normal text, but why **Intelligent Guess** not works in FF, even i set it's type is **"text"** explicitly?