I want to use whatsupweb phone
Version of Firefox that was used to post here:
User Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:30.0) Gecko/20100101 Firefox/30.0
Per this - https://web.whatsapp.com/ - looks like an app for a smart phone.
Perhaps either the Firefox for iOS or Firefox for Android support fora would be a more appropriate place to ask for Firefox support.
https://support.mozilla.org/en-US/ - different entry point for each of the many different "Firefox" support fora. Two selection buttons to the right of Mac, Windows, Linux support which you probably used to arrive here.