Examine source code of Mars another planet

{
  "name": "Mars another planet",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Mars another planet.jpg"
    },
    "colors": {
      "frame": "rgba(174, 187, 217, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(222, 27, 27, 1)",
      "toolbar_field": "rgba(201, 68, 20, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{56e1cfb1-7d93-4ae7-a309-614d9e280f70}"
    }
  }
}