Firefox died - ubuntu 20.10

Today I opened ubuntu and I used firefox but it can't load pages
I tried to remove and reinstall but nothing works
I had version 90 and I tried version 96 but firefox opens and can't load pages
I have also chromium and chromium has no problems to open web pages

How can I do?

Thank You from Italy


Are you still using Ubuntu MATE 20.10? as it's been end of life for some time.

Please see

Probably this:


What worked for me was disabling HTTP3 support with the 'network.http.http3.enabled' key in about:config and then restarting Firefox.