Examine source code of Valhalla Awaits

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Valhalla Awaits",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(46, 47, 46)",
      "toolbar_text": "rgb(214, 214, 214)",
      "frame": "rgb(46, 47, 46)",
      "tab_background_text": "rgb(214, 214, 214)",
      "toolbar_field": "rgb(46, 47, 46)",
      "toolbar_field_text": "rgb(214, 214, 214)",
      "tab_line": "rgb(34, 149, 128)",
      "popup": "rgb(66, 66, 66)",
      "popup_text": "rgb(214, 214, 214)",
      "icons_attention": "rgb(34, 149, 128)",
      "icons": "rgb(34, 149, 128)",
      "toolbar_bottom_separator": "rgb(34, 149, 128)",
      "toolbar_field_border_focus": "rgba(126, 128, 128, 0)",
      "toolbar_field_separator": "rgb(34, 149, 128)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_vertical_separator": "rgb(34, 149, 128)",
      "tab_loading": "rgb(34, 149, 128)"
    }
  }
}