Examine source code of fire fox simple style

{
  "name": "fire fox simple style",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "firefox_ヘッダー画像_03.jpg"
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(255, 204, 0, 0.23)",
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "bookmark_text": "rgba(252, 145, 5, 1)"
    }
  }
}