Examine source code of Dark Blue Bg

{
  "name": "Dark Blue Bg",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "sil2.png"
    },
    "colors": {
      "frame": "rgba(15, 46, 120, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(245, 171, 171, 1)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(255, 3, 3, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a5a8334f-9e74-47ca-86af-bed706e30ad6}"
    }
  }
}