Examine source code of Spider-Gwen

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Spider-Gwen",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 253, 241, 0.47)",
      "toolbar_field": "rgba(14, 196, 210, 0.15)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(228, 34, 123)",
      "popup": "rgb(255, 253, 241)",
      "popup_text": "rgb(228, 34, 123)",
      "tab_loading": "rgb(228, 34, 123)",
      "bookmark_text": "rgb(16, 177, 187)",
      "frame": "rgb(228, 34, 123)",
      "tab_background_text": "rgb(255, 255, 255)"
    }
  }
}