Examine source code of Bonusradar

{
  "manifest_version": 3,
  "name": "Bonusradar",
  "version": "0.4.1",
  "description": "Flags SAS EuroBonus partner shops in Sweden, Norway and Denmark as you browse, so you can shop via the portal and actually earn points.",
  "browser_specific_settings": {
    "gecko": {
      "id": "bonusradar@marcus",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "storage",
    "alarms"
  ],
  "host_permissions": [
    "*://onlineshopping.loyaltykey.com/*"
  ],
  "background": {
    "scripts": [
      "lib/compat.js",
      "lib/match.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "lib/compat.js",
        "lib/match.js",
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    },
    "default_title": "Bonusradar"
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  }
}