Examine source code of Auto Memory Saver

{
  "manifest_version": 3,
  "name": "Auto Memory Saver",
  "version": "1.0",
  "description": "自動でメモリを解放する拡張機能",
  "browser_specific_settings": {
    "gecko": {
      "id": "memory-saver@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "scripting",
    "browsingData"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "Memory Saver"
  }
}