Examine source code of Mario kart animated

{
  "name": "Mkartanimated",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "c134b4fb851a68591f561d6b0f47d613-ezgif.com-crop(2).gif"
    },
    "colors": {
      "frame": "rgba(113, 104, 173, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(10, 0, 66, 0.42)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(14, 0, 66, 0.46)",
      "toolbar_field_text": "rgba(0, 255, 179, 1)",
      "tab_line": "rgba(0, 255, 179, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e6e4399f-5f75-4dfe-a398-acd18740b218}"
    }
  }
}