Examine source code of My Custom Theme Halloween

{
  "manifest_version": 2,
  "name": "My Custom Theme Halloween",
  "version": "1.0",
  "description": "A custom theme for Firefox Halloween",
  "theme": {
    "images": {
      "theme_frame": "images/header.jpg"
    },
    "colors": {
      "frame": "#1a0948",
      "tab_background_text": "#FFFFFF",
      "toolbar_text": "#FFFFFF",
      "toolbar": "#33025a"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{625c6249-f725-405f-8311-cf5d3996fc22}"
    }
  }
}