Examine source code of Colors Blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Colors Blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-045-3e6898966e6ccdc87f80d23d4e7a6a49.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(35, 148, 212)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(12, 60, 89)",
      "tab_background_text": "rgb(254, 254, 254)",
      "toolbar_field": "rgb(30, 77, 103)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(71, 134, 169)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b3b15a09-3041-4a47-b1cf-fcca232dfe59}"
    }
  }
}