Mozilla want do download JSON object

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ASP.NET

MVC

Hello!

I has a project based on Asp.Net MVC2. There is a file uploader on the page. I use $.ajaxFileUpload to send image to controller.

Controller has a simple method, which accept image, do some calculations and return JSON object:

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult UploadMainPhoto(HttpPostedFileBase photo)
{
       ......
    return Json(new { path = "new image path" }, "text/json");
}

In IE it works ok. But Mozilla opens save dialog and offer to save JSON message.
Does anybody knows solution?

Thanks :)