Examine source code of Super Mushroom Red

{
  "name": "Super Mushroom Red",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Super Mushroom Red.png"
    },
    "colors": {
      "frame": "rgba(237, 28, 36, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(237, 28, 36, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(252, 215, 168, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9108050d-15b3-4fa1-9730-77cec97a8d69}"
    }
  }
}