Examine source code of I like this flag 5

{
  "theme": {
    "images": {
      "theme_frame": "enflag5.jpg"
    },
    "colors": {
      "frame": "#ebdd70",
      "tab_background_text": "#033305"
    }
  },
  "version": "2.0",
  "name": "I like this flag 5",
  "manifest_version": 2,
  "description": "Brazil flag in a football ball, bandera de Brasil en un balon de futbol, bandeira brasileira."
}