Examine source code of Tabs Magic

{
  "manifest_version": 3,
  "name": "Tabs Magic",
  "version": "1.0.18.9",
  "description": "Save and manage your tabs into visual columns.",
  "permissions": [
    "tabs",
    "storage",
    "activeTab",
    "contextMenus"
  ],
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "chrome_settings_overrides": {
    "homepage": "newtab.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "sageywang@gmail.com"
    }
  },
  "action": {
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}