Examine source code of Santander Shopping87

{
  "name": "Santander Shopping-assistent",
  "version": "3.4.1",
  "manifest_version": 2,
  "description": "Santander Shopping-assistent",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "storage",
    "webNavigation",
    "https://*.com/*",
    "https://*.se/*",
    "https://*.no/*",
    "https://*.dk/*",
    "notifications"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.com/*",
        "https://*.se/*",
        "https://*.no/*",
        "https://*.dk/*"
      ],
      "js": [
        "main.js"
      ],
      "all_frames": false
    }
  ],
  "web_accessible_resources": [
    "images/*.png",
    "*.css"
  ],
  "browser_action": {
    "default_icon": {
      "32": "images/icon32.png",
      "48": "images/icon48.png",
      "100": "images/icon100.png",
      "128": "images/icon128.png",
      "256": "images/icon128.png"
    },
    "default_title": "Santander Shopping-assistent"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9c5618ff-57f4-4b5d-b36b-28d679521535}"
    }
  }
}