Examine source code of Tab Reminder

{
  "manifest_version": 2,
  "name": "Tab Reminder",
  "description": "Set a reminder for the current tab after a given number of minutes; click notification to return to it",
  "version": "1.0",
  "icons": {
    "64": "icons/icon64.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "alarms",
    "notifications"
  ],
  "browser_action": {
    "default_icon": "icons/icon64.png",
    "default_title": "Tab Reminder",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5de8593a-b72a-40a6-a6f8-bd5a1714eaf4}",
      "strict_min_version": "96.0"
    }
  }
}