Browser can't load mail.protonmail.com

REPRODUCIBILITY (% or how often): 100%
BUILD ID = OS VERSION (Settings > About product): 3.4.0.24
HARDWARE (Jolla1, Tablet, XA2,…): XA2
UI LANGUAGE: Slovenian
REGRESSION: (compared to previous public release: Yes, No, ?): Yes

DESCRIPTION:

It’s not possible to load web email mail.protonmail.com as the page say Loading ProtonMail… at least for a very long time.

PRECONDITIONS:

None.

STEPS TO REPRODUCE:

  1. Open the page mail.protonmail.com

EXPECTED RESULT:

Email page opened.

ACTUAL RESULT:

Loading the page for hours.

ADDITIONAL INFORMATION:

I think is very easy to replicate. Please ask for more if needed.