Examine source code of deadpool icon

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "deadpool",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(83, 81, 54, 0.01)",
      "toolbar_text": "rgb(246, 7, 66)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(175, 175, 175)",
      "toolbar_field": "rgba(238, 7, 7, 0.22)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(244, 233, 1)",
      "popup": "rgba(231, 6, 40, 0.19)",
      "popup_text": "rgb(15, 195, 255)",
      "tab_loading": "rgb(244, 233, 1)"
    }
  }
}