Where is Epiphany's certificate store?

When I visit this site, https://stream1.fxxy.net/ <https://stream1.fxxy.net/> 
, in Google Chrome or Firefox I am connected and see that it's recognized as
a secure site with a valid security certificate verified by COMODO RSA
Domain Validation Secure Server CA. However, visiting the same URL with
Epiphany 3.24.1, the connection is blocked with an error message: "This
Connection is Not Secure" and "This website’s identification was not issued
by a trusted organization." I suspect Ephiphany is using a different
certificate store than Chrome or Firefox but I've been unable to locate it
to add the Comodo certificate. 
I tried to install the certificate following the instructions here: 
https://help.gnome.org/users/epiphany/stable/cert.html.en
<https://help.gnome.org/users/epiphany/stable/cert.html.en>   but it fails
with " p11-kit: no configured writable location to store anchors".
I tried to set up a pointer in the Epiphany certificate db which would refer
to the gnome-keyring certificate/key store following the instructions here
(modified for my Ubuntu 17.04 system): 
https://wiki.gnome.org/Projects/GnomeKeyring/ApplicationSetup
<https://wiki.gnome.org/Projects/GnomeKeyring/ApplicationSetup>   but this
has had no effect. I've confirmed that the Comodo certificate is contained
in the gnome-keyring.
Can anyone tell me where the Epiphany certificate store resides in Ubuntu
Gnome, or if it's using the system store, why it's not recognizing the
Comodo certificate as a valid certificate? Any help would be appreciated.



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