Examine source code of Super Secret

{
  "manifest_version": 3,
  "name": "Super Secret",
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@super-secret.net",
      "strict_min_version": "57.0"
    }
  },
  "version": "1.0.0",
  "description": "Remplit automatiquement les champs de connexion en utilisant les identifiants recueillis sur www.super-secret.net",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "background": {
    "scripts": [
      "sw.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "cs.js"
      ],
      "all_frames": false,
      "match_about_blank": true
    }
  ],
  "action": {
    "default_icon": "icons/icon-48.png",
    "default_title": "Super Secret",
    "default_popup": "popup.html"
  }
}