Is the WhatsApp web site issue on Firefox on Windows 10 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