Examine source code of Blue

{
  "name": "Blue",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Blue.png"
    },
    "colors": {
      "frame": "rgba(18, 53, 91, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(20, 83, 154, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(23, 69, 117, 1)",
      "toolbar_field_text": "rgba(172, 186, 202, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a2beb2f5-ae7e-447b-b9b7-a2de758eebd8}"
    }
  }
}