Examine source code of Blooket Blooks

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blooket Blooks",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(115, 156, 177, 0.69)",
      "toolbar_text": "rgba(23, 242, 207, 0.92)",
      "frame": "rgb(173, 217, 241)",
      "tab_background_text": "rgb(237, 77, 170)",
      "toolbar_field": "rgb(181, 224, 228)",
      "toolbar_field_text": "rgb(64, 69, 169)",
      "tab_line": "rgb(252, 0, 51)",
      "popup": "rgb(186, 188, 228)",
      "popup_text": "rgb(45, 167, 137)",
      "button_background_active": "rgb(87, 130, 175)",
      "tab_loading": "rgb(252, 0, 51)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{42e1f32e-2038-4fd5-a59c-f95ed80d6a55}"
    }
  }
}