Examine source code of Cat Nap

{
  "name": "Cat Nap",
  "manifest_version": 2,
  "version": "2.1resigned1",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff",
      "toolbar": "rgba(255, 247, 173, 0.14)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{892a1e94-f8e9-4ea0-b6ff-38c6533d4373}"
    }
  }
}