Examine source code of Link Highlighter

{
  "manifest_version": 3,
  "name": "Link Highlighter",
  "version": "1.5",
  "description": "Highlights all links opened while enabled.",
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon.png"
    }
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "109.0",
      "id": "{93070e97-cab0-454a-bdf1-df682dbe42f6}"
    }
  }
}