Examine source code of Gemini Original Image Downloader

{
  "manifest_version": 3,
  "name": "Gemini 原图下载助手",
  "version": "1.0.0",
  "description": "在 Gemini 网页中识别并下载当前页面已提供的最高可用分辨率图片。",
  "permissions": [
    "downloads",
    "storage",
    "notifications"
  ],
  "host_permissions": [
    "https://gemini.google.com/*",
    "https://*.googleusercontent.com/*",
    "https://*.gstatic.com/*"
  ],
  "background": {
    "service_worker": "background/service-worker.js",
    "scripts": [
      "shared/core.js",
      "background/service-worker.js"
    ]
  },
  "action": {
    "default_title": "Gemini 原图下载助手",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "assets/icons/icon-16.png",
      "32": "assets/icons/icon-32.png",
      "48": "assets/icons/icon-48.png",
      "128": "assets/icons/icon-128.png"
    }
  },
  "icons": {
    "16": "assets/icons/icon-16.png",
    "32": "assets/icons/icon-32.png",
    "48": "assets/icons/icon-48.png",
    "128": "assets/icons/icon-128.png"
  },
  "options_page": "options/options.html",
  "content_scripts": [
    {
      "matches": [
        "https://gemini.google.com/*"
      ],
      "js": [
        "shared/core.js",
        "content/content-script.js"
      ],
      "css": [
        "content/content-style.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y",
        "mac": "Command+Shift+Y"
      },
      "description": "打开 Gemini 原图下载助手"
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "gemini-original-image-helper@local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}