Examine source code of GreyOut V1

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Greyout",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-008-60d2718f8c915b5ba09f31df5555b459.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(102, 108, 112)",
      "toolbar_text": "rgb(151, 153, 221)",
      "frame": "rgb(83, 84, 85)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(16, 23, 158)",
      "tab_line": "rgb(52, 223, 40)",
      "popup": "rgb(253, 253, 253)",
      "popup_text": "rgb(12, 12, 75)",
      "tab_loading": "rgb(52, 223, 40)"
    }
  }
}