Examine source code of QuickLookup

{
  "manifest_version": 3,
  "name": "QuickLookup v2",
  "version": "2.2",
  "description": "Suche markierten Text blitzschnell mit einer Tastenkombination.",
  "permissions": [
    "storage",
    "tabs",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "action": {
    "default_popup": "options.html",
    "default_title": "QuickLookup v2 Einstellungen"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "sqmon@proton.me"
    }
  }
}