Examine source code of QdeskSigner

{
  "name": "QdeskSigner",
  "author": "Adera Pro Data",
  "description": "Qdesk Digital Signature for PDF",
  "icons": {
    "48": "logo48.png",
    "96": "logo96.png",
    "128": "logo128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "content.js"
      ],
      "matches": [
        "*://*/*",
        "file:///*"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "qsignerscript.js"
      ],
      "matches": [
        "*://*/*",
        "file:///*"
      ]
    }
  ],
  "manifest_version": 3,
  "version": "1.0",
  "permissions": [
    "nativeMessaging"
  ],
  "action": {
    "default_icon": "logo48.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "qdesksigner@qdesk.ro",
      "strict_min_version": "58.0"
    }
  }
}