Apr 30, 2020, 05:5704/30/20
Now Firefox shows the updated certificate with new expiration date:
Not After: 4/5/2022, 7:59:59 PM (Eastern Daylight Time)
Serial Number: 4F:74:BB:29:68:E8:36:78:0F:DD:D4:EC:37:98:55:3C
Fingerprints
SHA-256: 92:F6:9E:B3:2B:F8:F6:B7:51:F7:9A:16:67:A5:CA:39:4E:73:06:90:CD:3A:CE:C3:6D:1F:00:3A:FC:80:67:88
SHA-1: 6D:48:B4:53:C9:CE:0A:C9:18:07:72:4D:73:F6:0E:25:2C:A9:51:1A
Thank you for fixing it.