Update iframe.js (#2443)
Update iframe.js (#2443)

* Update iframe.js

Wappalyzer not work with Firebase
Chrome 68
MacOs 10.13
Uncaught TypeError: Cannot read property 'postMessageId' of null at onPostMessage (iframe.js:1000)

* Update iframe.js

* Update iframe.js

WPO-Foundation/Wappalyzer,AliasIO/wappalyzer,WPO-Foundation/Wappalyzer,WPO-Foundation/Wappalyzer,AliasIO/wappalyzer