Examine source code of 2FA Notifier

{
  "name": "2FA Notifier",
  "manifest_version": 2,
  "version": "0.8.2resigned1",
  "author": "Conor Gilsenan",
  "description": "Notifies users whether the current browser page supports 2FA or not.",
  "background": {
    "scripts": [
      "generatedJS/background.bundle.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "browserAction/popup.html",
    "default_title": "2FA Notifier",
    "default_icon": {
      "16": "icons/no_2fa.png",
      "32": "icons/no_2fa@2x.png",
      "48": "icons/no_2fa@3x.png"
    }
  },
  "icons": {
    "48": "icons/app_icon_48.png",
    "128": "icons/app_icon_128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "notifications"
  ],
  "web_accessible_resources": [
    "**/*.html",
    "**/*.css",
    "**/*.js",
    "**/*.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a880d064-81b7-43fb-a6e2-436de8961a72}"
    }
  }
}