Examine source code of The Dark World

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "The Green",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-001-9c6d74e14860e77ee6f8f43e824bff25.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(45, 72, 45)",
      "toolbar_text": "rgb(197, 218, 197)",
      "frame": "rgb(41, 46, 41)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(17, 20, 17)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(242, 238, 18)",
      "popup": "rgb(212, 242, 212)",
      "popup_text": "rgb(4, 4, 7)",
      "tab_loading": "rgb(242, 238, 18)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6a488c6d-9c44-4997-9826-f0f357303628}"
    }
  }
}