Examine source code of Clearly Reader

{
  "manifest_version": 3,
  "name": "__MSG_pkgName__",
  "version": "4.7.0",
  "description": "__MSG_pkgDescription__",
  "default_locale": "en",
  "permissions": [
    "contextMenus",
    "storage",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_title": "Active Clearly (Alt/Option+R)",
    "default_icon": {
      "16": "assets/icons/disable/ic_16.png",
      "32": "assets/icons/disable/ic_32.png",
      "48": "assets/icons/disable/ic_48.png",
      "128": "assets/icons/disable/ic_128.png"
    }
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "mac": "Alt+R",
        "windows": "Alt+R",
        "chromeos": "Alt+R",
        "linux": "Alt+R"
      },
      "description": "Active Clearly (Alt/Option+R)"
    },
    "skim-toggle": {
      "suggested_key": {
        "mac": "Alt+S",
        "windows": "Alt+S",
        "chromeos": "Alt+S",
        "linux": "Alt+S"
      },
      "description": "Toggle Skim panel (Alt/Option+S)"
    }
  },
  "background": {
    "scripts": [
      "background.bundle.js"
    ]
  },
  "icons": {
    "16": "assets/icons/readable/ic_16.png",
    "32": "assets/icons/readable/ic_32.png",
    "48": "assets/icons/readable/ic_48.png",
    "128": "assets/icons/readable/ic_128.png"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'",
    "sandbox": "sandbox allow-scripts allow-forms allow-popups allow-modals; script-src 'self'"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content.bundle.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b5a7d8f9-7631-4c8b-8fa0-fd03a9d281f6}",
      "strict_min_version": "112.0"
    }
  }
}