Examine source code of Tor Colours

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Tor Colours",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-025-ffb27cfded66d27a465aeffe41e9fe61.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(51, 58, 65)",
      "toolbar_field": "rgb(51, 58, 65)",
      "toolbar_field_text": "rgb(225, 226, 227)",
      "tab_line": "rgb(104, 176, 48)",
      "popup": "rgb(51, 58, 65)",
      "popup_text": "rgb(248, 249, 250)",
      "tab_loading": "rgb(104, 176, 48)",
      "bookmark_text": "rgb(248, 249, 250)",
      "frame": "rgb(89, 49, 107)",
      "tab_background_text": "rgb(248, 249, 250)"
    }
  }
}