Examine source code of Pikachu

{
  "name": "Pikachu",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "pika.jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(255, 255, 255, 0.6)",
      "bookmark_text": "rgba(3, 3, 3, 1)",
      "toolbar_field": "rgba(38, 38, 38, 0.38)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5b91d1b4-f046-4463-b2bc-3243fbe69b20}"
    }
  }
}