Examine source code of bOTP

{
  "name": "bOTP",
  "short_name": "bOTP",
  "description": "biell OTP",
  "version": "1.6.4resigned1",
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "botp@glaciated.org"
    }
  },
  "options_ui": {
    "page": "options.html"
  },
  "icons": {
    "16": "botp16.png",
    "19": "botp19.png",
    "38": "botp38.png",
    "48": "botp48.png",
    "128": "botp128.png",
    "256": "botp256.png"
  },
  "permissions": [
    "notifications",
    "clipboardWrite",
    "storage"
  ],
  "browser_action": {
    "default_title": "bOTP",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "botp16.png",
      "19": "botp19.png",
      "38": "botp38.png",
      "48": "botp48.png",
      "128": "botp128.png",
      "256": "botp256.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  }
}