Examine source code of Animal Friends

{
  "name": "Animal Friends",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "1.jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(154, 130, 232, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(200, 199, 219, 1)",
      "toolbar_field_text": "rgba(122, 22, 22, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5c14de27-2343-42ad-bc57-72aa1aaafd6c}"
    }
  }
}