Examine source code of PopupBlocker

{
  "manifest_version": 2,
  "name": "PopupBlocker",
  "version": "0.1",
  "description": "Blocks new tab creation",
  "permissions": [
    "tabs",
    "storage",
    "https://extensionpay.com/*"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "500": "icon128.png"
  },
  "background": {
    "page": "background.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{62e73e16-c99e-4090-be20-c93731bacf79}"
    }
  }
}