"(Callback method) not defined" in JSONP access in Firefox Addon

I am trying to get data from a server using JSONP using jQuery ajax.

$.ajax({
    dataType: "jsonp",
    url: "https://secure.flickr.com/services/feeds/photos_public.gne?tags=cat&tagmode=any&format=json",
    type: "GET",
    data: "msg=aaa",
    cache: true,
    jsonp: "jsoncallback",
    // jsonpCallback: "callbackmethod",

    success: function(encryptedMsg){
        console.log("Encryption success!");
    },
    error: function(req, errmsg, thrownError) {
        console.log("Error: HTTP " + req.status + " " + errmsg);
    }
});

However, the following error is displayed in the error console:

Error: jQuery1720502636097747291_1339479763752 is not defined
Source File: https://secure.flickr.com/services/feeds/photos_public.gne?tags=cat&tagmode=any&format=json&jsoncallback=jQuery1720502636097747291_1339479763752&msg=aaa
Line: 1

If you open the URL of the source file, you will see the following JSON, and it seems to be the correct JSON.

jQuery1720502636097747291_1339479763752({
    "title": "Recent Uploads tagged cat",
    // ...
    "items": [
    {
        "title": "Chaton",
        // ...
    },
    // ...
    ]
})

I also tried to specify the method name using jsonpCallback: "callbackmethod", but this did not work. I also used the $ .getJson () method and jquery-jsonp (http://code.google.com/p/jquery-jsonp/), but the result was the same.

Firefox browser and use of HTML4. This is used in the firefox add-on.

: https://builder.addons.mozilla.org/addon/1048275/revision/749
$.ajax getEncryptedMessage common-content.js

.