Is the WhatsApp web site issue on Firefox on Linux or is it actually on your Android phone with Firefox or Firefox on iPhone?. I have seen images showing the WhatsApp web site needs Firefox 115.0+ so perhaps the Firefox on your phone needs to be updated.

https://support.mozilla.org/en-US/kb/update-latest-version-firefox-android https://support.mozilla.org/en-US/kb/firefox-available-iphone-or-ipad-my-language

Please Open Tha App

whatsapp

bold text

I cannot open whatsapp

I cannot open the whatsapp web

no as to why whatsapp web has not been opened

I CANT OPEN WHATSAPP

The web whatsapp site should be saying you need Firefox 115.0 or newer if you have old Firefox versions.

https://support.mozilla.org/en-US/kb/update-firefox-latest-release