When I open web.whatsapp.com in Firefox (67.0.4, Win10) the QR code is not loaded. At the same time it does work in Chrome.

What I tried:

  • Reload
  • Clearing the cache
  • switch off add blocker
  • about:config privacy.resistFingerprinting = false

What I found:

  • Also a bug is described here but no solution. Unfortunately bug is closed https://bugzilla.mozilla.org/show_bug.cgi?id=1468870#c11
  • In the browser console I see the following errors: Firefox kann keine Verbindung zu dem Server unter wss://web.whatsapp.com/ws aufbauen. (~Firefox could not establish a connection to server)



I found a solution here: https://www.denniswilmsmann.de/2019/06/whatsapp-web-laedt-nicht-in-firefox/

  • about:config -> set network.http.spdy.websockets=false
  • restart firefox

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