Examine source code of Leviathan Blue v2

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Leviathan Blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(12, 15, 15)",
      "toolbar_text": "rgb(164, 221, 246)",
      "frame": "rgb(12, 15, 15)",
      "tab_background_text": "rgb(96, 146, 171)",
      "toolbar_field": "rgb(12, 15, 15)",
      "toolbar_field_text": "rgb(164, 221, 246)",
      "tab_line": "rgb(100, 138, 159)",
      "popup": "rgb(13, 30, 39)",
      "popup_text": "rgb(154, 203, 231)",
      "tab_loading": "rgb(100, 138, 159)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{abbeec83-4dbc-47b5-b98c-26d7bfaf7961}"
    }
  }
}