Examine source code of captureItem

{
  "manifest_version": 3,
  "name": "captureItem",
  "version": "1.3.6",
  "description": "Capture Item by id/class",
  "host_permissions": [
    "<all_urls>"
  ],
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "bookmarks"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "capture_item.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "capture_item@watana.be",
      "strict_min_version": "120.0"
    }
  },
  "options_ui": {
    "page": "options.html"
  }
}