Examine source code of Tab Memory Saver itst

{
  "manifest_version": 2,
  "name": "Tab Memory Saver",
  "version": "1.0",
  "description": "Automatically unload inactive tabs to save memory.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Tab Memory Saver",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9f54c4f4-225c-40f1-92f7-68d9a04b20ff}"
    }
  }
}