Examine source code of Let's explore together

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Let's explore together.",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-024-8de86d890779309c9a66423c64daa480.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(225, 234, 239, 0.41)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(60, 105, 134)",
      "tab_background_text": "rgb(255, 138, 163)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(123, 127, 204)",
      "tab_line": "rgb(255, 138, 163)",
      "popup": "rgb(225, 234, 239)",
      "popup_text": "rgb(60, 105, 134)",
      "tab_loading": "rgb(255, 138, 163)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{94578b24-337e-467a-86ac-66fe8d758a87}"
    }
  }
}