Whatsapp supports Firefox versions higher than 115 and you have 113. Please update Firefox to be able to use whatsapp.

''<p>ponnadglps [[#question-1553600|said]]</p>'' <blockquote>updates mozilla firefox and support whatsapp </blockquote> The message the web whatsapp site says it supports Firefox 115.0 and newer as they are giving this message if you are using a older Firefox version like the Firefox 113.0.2 you appear to have. If you are no longer getting package updates (including Firefox) in your package manager then your Linux distro version may not be supported with updates anymore. Either you need to instal a newer version of your Linux distro or use the Firefox Linux tarballs from Mozilla to get Firefox updates. https://support.mozilla.org/en-US/kb/install-firefox-linux