Examine source code of EPCkey

{
  "version": "1.0.3",
  "manifest_version": 2,
  "name": "EPC",
  "short_name": "ARM SIGN",
  "description": "Расширение для плагина ARM SIGN",
  "permissions": [
    "nativeMessaging",
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./js/content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "16": "./images/test_icon_16x16.png",
    "48": "./images/test_icon_48x48.png",
    "128": "./images/test_icon_128x128.png"
  },
  "browser_action": {
    "default_icon": "./images/test_icon48.png",
    "default_popup": "./html/popup.html",
    "default_title": "EPC: Нажмите для более подробной информации"
  },
  "background": {
    "scripts": [
      "./js/background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "epc-apikey@epc"
    }
  }
}