Examine source code of better black

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "better black",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-001-9c6d74e14860e77ee6f8f43e824bff25.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(1, 11, 32, 0.82)",
      "toolbar_text": "rgb(66, 165, 165)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(201, 221, 255)",
      "toolbar_field": "rgba(4, 4, 4, 0.2)",
      "toolbar_field_text": "rgb(236, 238, 240)",
      "tab_line": "rgb(138, 199, 173)",
      "popup": "rgb(3, 44, 52)",
      "popup_text": "rgb(232, 236, 170)",
      "button_background_hover": "rgb(28, 90, 151)",
      "ntp_background": "rgb(1, 19, 30)",
      "tab_loading": "rgb(138, 199, 173)"
    }
  }
}