Examine source code of Polypane helper

{
  "name": "Polypane helper",
  "version": "4.0.1",
  "manifest_version": 3,
  "description": "Open the current page or links in Polypane, the developer tool for responsive web development and design.",
  "homepage_url": "https://polypane.app",
  "browser_specific_settings": {
    "gecko": {
      "id": "{b4d2e20e-7b82-4e89-a591-fd2f7a7abd98}",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "service_worker": "src/open.js",
    "scripts": [
      "src/open.js"
    ]
  },
  "permissions": [
    "activeTab",
    "tabs",
    "contextMenus",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "src/content.js"
      ],
      "all_frames": false
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "icons/icon16.png",
        "icons/icon48.png"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    }
  ],
  "options_ui": {
    "page": "src/options.html",
    "open_in_tab": true
  },
  "action": {
    "default_icon": "icons/icon19.png",
    "default_title": "Open current tab in Polypane (Alt + P)"
  },
  "commands": {
    "open-in-polypane": {
      "suggested_key": {
        "default": "Alt+P"
      },
      "description": "Open current tab in Polypane"
    }
  }
}