Examine source code of Web eID

{
  "manifest_version": 2,
  "name": "Web eID",
  "version": "2.2.1",
  "description": "Use your electronic identification card for secure authentication and digital signing.",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "{e68418bc-f2b0-4459-a9ea-3e72b6751b07}"
    }
  },
  "icons": {
    "128": "icons/web-eid-icon-128.png"
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "*://*/*"
      ],
      "all_frames": true
    }
  ],
  "browser_action": {
    "default_icon": "icons/web-eid-icon-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "*://*/*",
    "nativeMessaging"
  ]
}