Examine source code of Dark Me

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Dark Me",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(95, 95, 95)",
      "toolbar_field": "rgb(66, 67, 67)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 0, 0)",
      "popup": "rgb(74, 74, 79)",
      "popup_text": "rgb(249, 249, 255)",
      "tab_loading": "rgb(255, 0, 0)",
      "bookmark_text": "rgb(255, 255, 255)",
      "frame": "rgb(50, 50, 50)",
      "tab_background_text": "rgb(230, 235, 237)"
    }
  }
}