Examine source code of Class Meet Reminder

{
  "name": "Class Meet Reminder",
  "background": {
    "scripts": [
      "popup.js"
    ],
    "persistent": true
  },
  "description": "This utility helps users manage class codes and times of all class sessions. When it's time for class, the browser will automatically open the class page so users can join immediately without needing to search manually.",
  "version": "0.1",
  "manifest_version": 2,
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "128": "photo.png"
    }
  },
  "icons": {
    "128": "photo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f4948378-2653-42db-94dd-23d97e5c9e14}"
    }
  }
}