Examine source code of Gemini Timeline

{
  "manifest_version": 3,
  "name": "Gemini Timeline",
  "version": "1.0.0",
  "description": "为 Gemini 添加时间线侧边栏，实现对话历史的快速导航与回顾。",
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://gemini.google.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "gemini-timeline@chigengyi.cn",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}