Examine source code of Firstthemev

{
  "name": "First",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "venice.jpg"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(79, 65, 65, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{55de1fa4-0dc4-4857-b497-5d8100cd3e6d}"
    }
  }
}