Examine source code of Sweet Summer by MaDonna

{
  "name": "Sweet Summer by MaDonna",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "1A.jpg"
    },
    "colors": {
      "frame": "rgba(147, 187, 237, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(147, 186, 237, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(147, 186, 237, 0.11)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fe253fbe-acd3-4d93-bb91-5034562cdd0f}"
    }
  }
}