Serving application with wrong mime type

My MVC 2 application seems to be serving pages as application/vnd.wap.xhtml+xml in Firefox Beta 10.

Works fine in other browsers.

Any ideas? Is this a bug i FF4 and shou开发者_高级运维ld I just ignore it?

We are having the same trouble with our asp.net 2.0 WebForms Using 51Degrees.mobi and WURFL. Anyway, upgrading to the latest version of 51Degrees solved our problem. We also made sure that Firefox 4.0 was in our web_browsers_patch.xml file.

We were running WURFL (http://wurfl.sourceforge.net/) - which wasnt quite ready to handle Beta 10