Examine source code of Cool Refresh

{
  "manifest_version": 3,
  "name": "Cool Refresh",
  "version": "12.0.0",
  "description": "Customizable pull-to-refresh instead of the built-in one.",
  "options_ui": {
    "page": "index.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "64": "icons/64.png",
    "128": "icons/128.png"
  },
  "action": {
    "default_icon": {
      "16": "icons/16.png",
      "32": "icons/32.png",
      "48": "icons/48.png",
      "64": "icons/64.png",
      "128": "icons/128.png"
    }
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "coolrefresh@pro-bandey.com",
      "strict_min_version": "146.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "146.0"
    }
  }
}