Appearance of a black rectangle

So you've deactivated your modules, you're up to date.....

Have you reset Firefox?
https://www.commentcamarche.net/faq/s/reinitialiser%20firefox

And what about an infection, what do you think?

Do you have any additional details?

Check here/
https://blog.developpez.com/cchatelain/p7336/informatique/que_faire_quand_firefox_ne_fonctionne_pl

You can uninstall it in safe mode with Revo Uninstaller
and pick it up again?
--
A gardener who sabotages a lawn is an amateur gardener.

Thank you for your response. I did as you indicated, but unfortunately, it hasn't improved.
When I open Firefox, my screen is now all black with a small white square before the Google homepage appears;

hello

check the complementary modules of firefox/disable them....
and re-enable them gradually.

or reset firefox.

eventually, if windows is up to date, you update your software
with update checker?

--
a gardener who sabotages a lawn is a novice gardener.

No one can provide information about this problem?

I specify that it only happens with Firefox

Thank you