Examine source code of Gemini Brancher

{
  "manifest_version": 3,
  "name": "Gemini Brancher",
  "version": "1.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "gemini-brancher@martijnd",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ]
      }
    }
  },
  "description": "Branch your Gemini chats into new conversations.",
  "developer": {
    "name": "Martijn Dormans",
    "url": "https://github.com/martijndormans"
  },
  "permissions": [
    "storage",
    "tabs",
    "activeTab"
  ],
  "host_permissions": [
    "https://gemini.google.com/*"
  ],
  "action": {
    "default_title": "Branch this Chat",
    "default_icon": {
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://gemini.google.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}