Firefox OS app does not appear after deploying to Panasonic TV

I created a simple Firefox OS app and successfully deployed it on a Panasonic TV using Firefox WebIDE. The app is displayed on the Apps page and it runs successfully. However, the icon is missing.

I used the following manifest file:

{
    "name": "my app",
    "description": "just a simple one page app",
    "version": "1.0",
    "launch_path": "/path/Default.aspx",
    "icons": {
        "16": "/path/Images/icon-16.png",
        "48": "/path/Images/icon-48.png",
        "128": "/path/Images/icon-128.png",
        "336": "/path/Images/icon-336.png",
        "512": "/path/Images/icon-512.png"
    },
    "fullscreen": true
}

      

        
        
        
      

    

All icon files are present in this location. Can anyone tell me how to get the icon on the Apps page on my TV?