Examine source code of Image Harvester

{
  "description": "精准、高效地下载网页中的图片. Download images on web pages precisely and efficiently.",
  "manifest_version": 2,
  "name": "Image Harvester",
  "version": "1.5.5",
  "author": "zzR",
  "browser_action": {
    "browser_style": true,
    "default_popup": "popup/panel.html",
    "default_icon": {
      "16": "icons/page-16.png",
      "32": "icons/page-32.png"
    }
  },
  "permissions": [
    "activeTab",
    "downloads",
    "storage",
    "scripting"
  ],
  "developer": {
    "name": "zzR",
    "url": "https://gitee.com/zzr771"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f29d7f08-7c47-4e62-afd7-245074acf15c}"
    }
  }
}