Examine source code of Leviathan Blue

{
  "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, 27, 36)",
      "toolbar_text": "rgb(156, 185, 223)",
      "frame": "rgb(12, 27, 36)",
      "tab_background_text": "rgb(108, 131, 162)",
      "toolbar_field": "rgb(12, 27, 36)",
      "toolbar_field_text": "rgb(194, 222, 249)",
      "tab_line": "rgb(137, 204, 235)",
      "popup": "rgb(12, 27, 36)",
      "popup_text": "rgb(127, 170, 230)",
      "tab_loading": "rgb(137, 204, 235)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{81d27215-854e-4699-88bb-3cfe74c2355c}"
    }
  }
}