Examine source code of Earthbound Main

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Earthbound Main ",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(14, 0, 40)",
      "toolbar_text": "rgb(240, 103, 90)",
      "frame": "rgb(30, 0, 56)",
      "tab_background_text": "rgb(212, 212, 212)",
      "toolbar_field": "rgb(47, 27, 83)",
      "toolbar_field_text": "rgb(135, 255, 106)",
      "tab_line": "rgb(0, 220, 255)",
      "popup": "rgb(23, 0, 66)",
      "popup_text": "rgb(255, 121, 109)",
      "popup_border": "rgba(113, 113, 75, 0)",
      "tab_selected": "rgba(44, 0, 255, 0)",
      "toolbar_field_border": "rgba(248, 255, 0, 0)",
      "tab_loading": "rgb(0, 220, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dae2a454-1d3a-4bc1-a89e-b2c8f7a26645}"
    }
  }
}