Examine source code of Page restore

{
  "manifest_version": 2,
  "name": "Plugin",
  "version": "2.2.4",
  "browser_action": {},
  "permissions": [
    "contextMenus",
    "tabs",
    "clipboardWrite",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "web_accessible_resources": [
    "start.html",
    "start.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      },
      "id": "{3e7b22d0-c555-48df-bfab-fcd7d8f2790c}"
    }
  }
}