In Not Before and Not After we are showing our current timezone and UTC, the last one was added for testing, so it shouldn't be rendered.
Pushed by firstname.lastname@example.org:
Avoids rendering UTC time zone in Validity Section.r=johannh
I've managed to reproduce this issue using Firefox 70.0a1 (20190811215021).
This is verified fixed using Firefox 71.0a1 ( 20191006214844) on the following OSes: Windows 10x64, Ubuntu 18.04x64 and macOS 10.13.