Examine source code of Minecraft Theme Epic

{
  "name": "Minecraft Theme Epic",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Thumbnail - Copy - Copy.png"
    },
    "colors": {
      "frame": "rgba(255, 234, 158, 1)",
      "tab_background_text": "rgba(255, 161, 158, 1)",
      "toolbar": "rgba(250, 218, 231, 1)",
      "bookmark_text": "rgba(255, 161, 158, 1)",
      "toolbar_field_text": "rgba(255, 161, 158, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3fa408ad-6a35-4ab7-bcea-66e686f24403}"
    }
  }
}