Examine source code of Puzzle pieces

{
  "name": "Puzzle pieces",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Puzzle pieces.jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(209, 195, 104, 1)",
      "toolbar": "rgba(119, 224, 150, 1)",
      "toolbar_field": "rgba(120, 219, 189, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{371ac2c7-24bf-48f1-957f-cbc35ce06b77}"
    }
  }
}