Examine source code of UrlTool

{
  "description": "這是開發中的工具，請勿下載。網址小工具，用來處理網址轉跳後到想去的地方",
  "manifest_version": 2,
  "name": "UrlTool",
  "version": "1.0.4",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "permissions": [
    "storage",
    "webNavigation"
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "urltool.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{608ab357-8f9d-4589-8a14-39bd4a34fa52}",
      "strict_min_version": "57.0a1"
    }
  }
}