Examine source code of red hearts flying

{
  "theme": {
    "images": {
      "theme_frame": "redhearts.JPG"
    },
    "colors": {
      "frame": "#171717",
      "tab_background_text": "#de3e3e"
    }
  },
  "version": "2.0",
  "name": "red hearts flying",
  "manifest_version": 2,
  "description": "like it."
}