Examine source code of Metric

{
  "name": "Cell (Dragon Ball)",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "cell.png"
    },
    "colors": {
      "frame": "rgba(41, 105, 255, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8b12b805-a7ec-428d-86c2-491ac48c1e6e}"
    }
  }
}