Examine source code of iSenhas

{
  "manifest_version": 2,
  "default_locale": "en",
  "name": "__MSG_extension_name__",
  "description": "__MSG_extension_description__",
  "version": "1.15",
  "icons": {
    "48": "images/icon-48.png",
    "96": "images/icon-96.png",
    "128": "images/icon-128.png",
    "256": "images/icon-256.png",
    "512": "images/icon-512.png"
  },
  "browser_action": {
    "default_popup": "senhas.html",
    "default_icon": {
      "16": "images/toolbar-icon-16.png",
      "19": "images/toolbar-icon-19.png",
      "32": "images/toolbar-icon-32.png",
      "38": "images/toolbar-icon-38.png",
      "48": "images/toolbar-icon-48.png",
      "72": "images/toolbar-icon-72.png"
    }
  },
  "permissions": [
    "activeTab",
    "<all_urls>",
    "cookies"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9bbf3b86-1b8c-4f01-af59-4c1a32dc1175}"
    }
  }
}