Examine source code of Passwordify

{
  "manifest_version": 2,
  "name": "Passwordify",
  "version": "1.0",
  "description": "Generate passwords.",
  "icons": {
    "48": "icons/icon.svg"
  },
  "background": {
    "scripts": [
      "background/main.js"
    ],
    "persistent": false
  },
  "permissions": [
    "activeTab",
    "contextMenus"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ce7da71a-7cae-4fac-80a9-ab5b7300734f}"
    }
  }
}