Examine source code of Blue and Grey

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blue and Grey",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-029-cc9cab928c1799136d18758709e91ecc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(147, 145, 147, 0.77)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 7, 255)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(255, 255, 255, 0.21)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(147, 145, 147)",
      "popup": "rgb(147, 145, 147)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(147, 145, 147)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9330711d-0d83-47d7-b3a1-002e3c8b93f7}"
    }
  }
}