i have found the solution i was using an extension which was disabling javascript code to run

Care to tell us what extension was responsible?

https://addons.mozilla.org/en-US/firefox/addon/disable-javascript/ it was this extension, i had downloaded it by mistake.

Thanks. In my case, with all extensions fully disabled WhatsApp Web is still not working (not loading).

I even disabled Firefox's Enhanced Tracking Protection for https://web.whatsapp.com/ to no avail.

Will keep trying...

do one thing just refresh your browser go to about:support and just refresh firefox, it will remember all the passwords and cookies but will set default values in about:config, try this and if you use firefox sync it will automatically download all your extensions.

Many thanks. It did the trick.

Not sure how as the problem was only for loading the new WhatsApp Web, nothing else, but it's working and no data was lost (except for the dictionaries, that had to be reinstalled).

Best.

hey afrachel, happy to help!! sorry you lost your dictionaries

It's OK. Just a minor inconvenience.

The strange thing is that WhatsApp Web is still no loading in private windows. It loads fine in standard windows/tabs, but not during Private Browsing. :-(

Edge's InPrivate windows work fine with WhatsApp Web.

Because firefox is suck!!!!!!!!!!!

web.whatsapp.com is not loading on Firefox

Please,

it is NOT about - old version - cookie, cache - old computer - refresh this or that - restart computer

No, it is not none of the above!

Firefox simply incapable to load web.whatsapp.com

firefox does not or can not load web.whatsapp.com

Ubuntu 22.04 Firefox 100.0.1

lmao try to refresh the browser also update whatsapp in your phone, that also works sometimes ig:(