Examine source code of steam delivery

{
  "name": "steam delivery",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "ezgif-frame-001.png"
    },
    "colors": {
      "frame": "rgba(240, 183, 211, 1)",
      "tab_background_text": "rgba(240, 183, 211, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cc65eebb-61d8-4d34-88c3-d51d8d6a9f29}"
    }
  }
}