Examine source code of Always with you

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "#b0a9a9",
      "tab_background_text": "#f7f4f4"
    }
  },
  "version": "2.0",
  "name": "Always with you",
  "manifest_version": 2,
  "description": "a secret I will take to my grave..."
}