Mozilla Firefox 84.0.2, Windows 10
Sin complementos/extensiones. También sucede en Microsoft Edge.
Salida de curl -vvvvv https://addons.mozilla.org/:
* Trying 44.239.254.46...
* TCP_NODELAY set
* Connected to addons.mozilla.org (44.239.254.46) port 443 (#0)
* schannel: SSL/TLS connection with addons.mozilla.org port 443 (step 1/3)
* schannel: checking server certificate revocation
* schannel: sending initial handshake data: sending 189 bytes...
* schannel: sent initial handshake data: sent 189 bytes
* schannel: SSL/TLS connection with addons.mozilla.org port 443 (step 2/3)
* schannel: failed to receive handshake, need more data
* schannel: SSL/TLS connection with addons.mozilla.org port 443 (step 2/3)
* schannel: failed to receive handshake, SSL/TLS connection failed
* Closing connection 0
* schannel: shutting down SSL/TLS connection with addons.mozilla.org port 443
* Send failure: Connection was reset
* schannel: failed to send close msg: Failed sending data to the peer (bytes written: -1)
* schannel: clear security context handle
curl: (35) schannel: failed to receive handshake, SSL/TLS connection failed
Respuesta1
Resulta que el gobierno estaba bloqueando el sitio debido a complementos de proxy y VPN y demás, pero ya no está bloqueado porque bloquear todo el sitio de complementos interrumpe el trabajo.