Examine source code of Splatoon 3 (Team Past)

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Splatoon 3 (Team Past)",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(28, 28, 28)",
      "toolbar_text": "rgb(245, 39, 88)",
      "frame": "rgb(30, 104, 250)",
      "tab_background_text": "rgb(28, 28, 28)",
      "toolbar_field": "rgb(251, 120, 35)",
      "toolbar_field_text": "rgb(28, 28, 28)",
      "tab_line": "rgb(251, 120, 35)",
      "popup": "rgb(28, 28, 28)",
      "popup_text": "rgb(245, 39, 88)",
      "tab_loading": "rgb(251, 120, 35)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{443f7b73-992e-4a05-8705-64d76fdfbd28}"
    }
  }
}