Examine source code of Tab Rename

{
  "manifest_version": 3,
  "name": "Tab Rename",
  "version": "1.0.1",
  "description": "Rename any browser tab to a custom title, and revert to the page's original title whenever you like.",
  "author": "Sean Breen",
  "browser_specific_settings": {
    "gecko": {
      "id": "{386f4cbd-d8bb-4538-aa84-156ce81fe899}",
      "strict_min_version": "115.0"
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "contextMenus"
  ],
  "action": {
    "default_title": "Rename this tab",
    "default_popup": "popup/popup.html",
    "default_icon": "icons/icon.svg"
  },
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ]
}