manifest.json

{
  "name": "Tasks",
  "description": "Google Tasks lets you create a to-do list within your Google Chrome(as extension) or your Desktop Gmail or the Google Tasks mobile app. When you add a task, you can integrate it into your Gmail calendar, and add details or subtasks",
  "version": "1",
  "manifest_version": 3,

  "action": {
    "default_popup": "Pop_Up.html",
    "default_icon": {
      "16": "/img/icon-16x16.png",
      "32": "/img/icon-32x32.png",
      "48": "/img/icon-48x48.png",
      "128": "/img/icon-128x128.png"
    }
  },
  "icons": {
    "16": "/img/icon-16x16.png",
    "32": "/img/icon-32x32.png",
    "48": "/img/icon-48x48.png",
    "128": "/img/icon-128x128.png"
  }
}