Examine source code of Inactive Tab Manager

{
  "manifest_version": 2,
  "name": "Inactive Tab Manager",
  "version": "1.0",
  "description": "A lightweight browser extension that automatically manages inactive tabs to optimize memory usage.",
  "browser_action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "tabs",
    "webNavigation"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{34895b45-cc12-47ca-8d8a-71a68e704906}"
    }
  }
}