Examine source code of pwGenerator

{
  "name": "pwGenerator",
  "version": "1.0",
  "description": "Generate a password ",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "storage",
    "declarativeContent"
  ],
  "page_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/house-key16.png",
      "32": "images/house-key32.png",
      "64": "images/house-key64.png",
      "128": "images/house-key128.png"
    }
  },
  "icons": {
    "16": "images/house-key16.png",
    "32": "images/house-key32.png",
    "64": "images/house-key64.png",
    "128": "images/house-key128.png"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{d735a50d-291c-4c33-818e-5330196d2450}"
    }
  }
}