Examine source code of Card security symbol

{
  "manifest_version": 2,
  "name": "Card security symbol",
  "version": "1.0",
  "description": "The card security symbol is commonly used in online payment interfaces, banks, e-wallets, or payment gateways to show that card information is securely protected.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Click me!"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{69b238ec-f844-48f0-8e83-d3dcbabfb3a4}"
    }
  }
}