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update

You appear to be using Firefox 102.0.1 on the eol Windows 7?

If you are indeed running the old eol Windows 7 then you can download the current Firefox 115 ESR (115.29.0esr) at https://www.firefox.com/download/all/desktop-esr/ as you pick 32-bit or 64-bit then language then click on the [Download ESR 115].

https://support.mozilla.org/en-US/kb/firefox-users-windows-7-8-and-81-moving-extended-support

update

Is the WhatsApp web site issue on Firefox on Windows 7 or is it actually on your Android phone with Firefox or Firefox on iPhone?. I have seen images from mobile users 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