Examine source code of Darklight

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Darklight",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-037-b73f9b34467ba541de861f5b4c0c6316.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(46, 44, 44)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(107, 103, 104)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(109, 0, 26)",
      "tab_loading": "rgb(107, 103, 104)",
      "bookmark_text": "rgb(0, 0, 250)",
      "frame": "rgb(108, 8, 36)",
      "tab_background_text": "rgb(255, 255, 255)"
    }
  }
}