Examine source code of Test Cards

{
  "manifest_version": 2,
  "name": "Test Cards",
  "description": "Copy and prefill test card numbers and other payment methods with a single click.",
  "version": "1.1.3",
  "icons": {
    "16": "images/icon-16.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "permissions": [
    "scripting",
    "activeTab",
    "storage",
    "webNavigation",
    "https://*/*",
    "http://*/*"
  ],
  "web_accessible_resources": [
    "/data/**/*.json"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "test-cards-extension@edwardji.dev",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "sidebar_action": {
    "default_panel": "sidepanel.html",
    "default_icon": {
      "16": "images/icon-16.png",
      "48": "images/icon-48.png",
      "128": "images/icon-128.png"
    }
  },
  "browser_action": {
    "default_title": "Test Cards"
  }
}