Examine source code of Nosferatu-2

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "second_theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.01)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(26, 16, 91, 0.62)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(76, 1, 252)",
      "popup": "rgba(26, 16, 91, 0.7)",
      "popup_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(76, 1, 252)",
      "tab_selected": "rgba(0, 0, 0, 0.5)",
      "toolbar_field_border_focus": "rgb(76, 1, 252)",
      "toolbar_field_border": "rgb(76, 1, 252)",
      "tab_loading": "rgb(76, 1, 252)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{04495c8f-6479-41c8-ac25-22eb7bde638b}"
    }
  }
}