Examine source code of Debian Red Logo Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Debian Red Logo",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(23, 23, 23, 0.47)",
      "toolbar_text": "rgb(143, 143, 143)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(140, 140, 140)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(225, 225, 225)",
      "tab_line": "rgba(255, 255, 255, 0.54)",
      "popup": "rgb(23, 23, 23)",
      "popup_text": "rgb(140, 140, 140)",
      "ntp_background": "rgb(23, 23, 23)",
      "tab_loading": "rgba(255, 255, 255, 0.54)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cd1fc2db-e921-4c23-a49e-744f3939285b}"
    }
  }
}