Examine source code of Bookmark Exporter (CSV)

{
  "manifest_version": 2,
  "name": "Bookmark Exporter (CSV)",
  "version": "1.0.0",
  "description": "Export your Firefox bookmarks to CSV (Title, URL, Folder, Date Added).",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "bookmarks",
    "downloads"
  ],
  "browser_action": {
    "default_title": "Bookmark Exporter (CSV)",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "109.0",
      "id": "{55a6a3a4-af03-4091-aae5-1ec6a8f1ac88}"
    }
  }
}