Examine source code of Curious Polar Bear

{
  "name": "Curious Polar Bear",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "CuriousPolarBearH.jpg"
    },
    "colors": {
      "frame": "rgba(212, 225, 247, 1)",
      "tab_background_text": "rgba(3, 3, 3, 1)",
      "toolbar": "rgba(212, 225, 247, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(215, 227, 250, 0.06)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{47a4e588-5f35-40f0-8bd6-10f4ddf8d739}"
    }
  }
}