Examine source code of Syrup

{
  "manifest_version": 3,
  "name": "Syrup (Open Beta)",
  "description": "A Honey alternative, find and apply the best coupons automatically.",
  "version": "0.4",
  "default_locale": "en",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "icons/Syrup.png",
      "48": "icons/Syrup.png",
      "128": "icons/Syrup.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "icons/Syrup.png",
        "_locales/*/messages.json"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "syrup@extension"
    }
  }
}