abrowser lists Trisquel addon website as non-trusted site -> know issue ?

Hi all,

I experienced similar behaveiour on my Trisquel 5.5 box and my freshly install Trisquel 6.0 box when accessing the add-on page inside Abrowser:
The browser lists the add-on page as non-trusted site because he is unable to build the certificate chain. If you access trisquel.info via https and add the certificate to your certificate memory everything is fine but this shouldn't be the standard behaveiour for standard users, shouldn't it ?

TIA,
Holger