Examine source code of Secure password generator

{
  "manifest_version": 2,
  "name": "Secure password generator",
  "author": "Gwarek2",
  "version": "1.0.1",
  "description": "Simple password generator.\n",
  "applications": {
    "gecko": {
      "id": "{a31031e6-d97b-4093-9942-c8d51c546b2e}"
    }
  },
  "browser_action": {
    "default_title": "Password generator",
    "default_popup": "src/popup.html",
    "default_icon": {
      "16": "src/images/icons/icon16.png",
      "32": "src/images/icons/icon32.png",
      "48": "src/images/icons/icon48.png",
      "128": "src/images/icons/icon128.png"
    }
  },
  "icons": {
    "16": "src/images/icons/icon16.png",
    "32": "src/images/icons/icon32.png",
    "48": "src/images/icons/icon48.png",
    "128": "src/images/icons/icon128.png"
  },
  "permissions": [
    "*://password-generator-api.herokuapp.com/*",
    "webRequest",
    "storage"
  ]
}