Examine source code of Small Tortoiseshell

{
  "theme": {
    "images": {
      "theme_frame": "Header.jpg"
    },
    "colors": {
      "frame": "#1b47f7",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Small Tortoiseshell",
  "manifest_version": 2,
  "description": "This Persona Theme shows a small tortoiseshell butterfly, which was photographed by myself. Also this is my first Persona! :)"
}