Examine source code of Blue Origin

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blue Origin",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(12, 12, 243, 0.8)",
      "toolbar_text": "rgb(233, 234, 244)",
      "frame": "rgb(117, 117, 128)",
      "tab_background_text": "rgb(233, 234, 244)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(48, 50, 52)",
      "tab_line": "rgb(12, 12, 243)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(48, 50, 52)",
      "tab_loading": "rgb(12, 12, 243)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cb9dc607-58b5-4869-8d7f-195371140171}"
    }
  }
}