Examine source code of Env Grabber

{
  "manifest_version": 3,
  "name": "__MSG_title_app__",
  "description": "__MSG_label_app_description__",
  "version": "3.2.0",
  "icons": {
    "16": "img/icon-16.png",
    "32": "img/icon-32.png",
    "48": "img/icon-48.png",
    "128": "img/icon-128.png",
    "192": "img/icon-192.png"
  },
  "default_locale": "en",
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "action": {
    "default_title": "Env Grabber",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "img/icon-16.png",
      "32": "img/icon-32.png",
      "48": "img/icon-48.png",
      "128": "img/icon-128.png",
      "192": "img/icon-192.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{553de929-2a2e-4b64-9b18-805d5f84eed2}",
      "strict_min_version": "140.0"
    }
  }
}