Examine source code of Mona - Password Manager

{
  "manifest_version": 2,
  "name": "mona",
  "version": "0.2resigned1",
  "description": "A less nosy password manager",
  "icons": {
    "48": "icons/mona-48.png"
  },
  "background": {
    "scripts": [
      "index.js"
    ]
  },
  "permissions": [
    "nativeMessaging"
  ],
  "applications": {
    "gecko": {
      "id": "mona@the-gitdb-cooperative.org",
      "strict_min_version": "50.0"
    }
  },
  "browser_action": {
    "default_icon": "icons/mona-32.png",
    "default_title": "mona",
    "default_popup": "popup/mona.html"
  }
}