The main issue is the WhatsApp web site appears to be looking for Firefox 115 and later versions recently it seems. People having issues with Whatsapp web site tends to be using a version older than Firefox 115.0 https://support.mozilla.org/en-US/kb/update-firefox-latest-release https://www.firefox.com/download/all/desktop-release/ (Firefox 145.0.1 Release) https://www.firefox.com/download/all/desktop-esr/ (Firefox 140.5.0esr)