Examine source code of ES-Clouds

{
  "name": "Car House",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "artworks-mQpxdcIdmUvU-0-t500x500.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(63, 101, 117, 1)",
      "bookmark_text": "rgba(63, 101, 117, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0.24)",
      "tab_line": "rgba(35, 120, 85, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e65dfe1a-0eb3-411e-be2a-438a83a89ef6}"
    }
  }
}