protonmail.com broken on OpenBSD 6.2-Stable with Firefox

[tec...@protonmail.com]

> Hello,
>
> Can't get to the login page on FF, just see a never ending loop of 'Loading 
> Protonmail...'
>
> Damn frustrating.  I can confirm this has happened with 3 different installs.
>
> Having to use chromium, definitely not a good solution for a Google-hater.
>
> Thanks