You have 110, so you have to update to use whatsapp

https://support.mozilla.org/en-US/kb/install-firefox-linux Though if your have 32-bit Linux then use the Firefox 140 ESR currently at 140.5.0esr. As Firefox 145.0 and on has dropped 32-bit Linux support. https://www.firefox.com/download/all/desktop-esr/ ''<p>Jada Patricia Mbou [[#question-1553070|said]]</p>'' <blockquote>it says that whatsapp web only works at Version 115 </blockquote> It says you need Firefox 115 or newer to use the web whatsapp site. You appear to have the older Firefox 110.0 Whatsapp may have picked Firefox 115 as the minimum because it supports the Windows 7, 8, 8.1 and macOS 10.12, 10.13, 10.14 OS users also as Mozilla still supports those old eol OS's with Firefox 115 ESR currently at 115.30.0esr.