18.1.2326 HTTPS scanning

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Hello,

In a fresh install (18.1.2326) on windows 10 64 bits (build 16299.248), https scanning doesn't seem to work with Firefox 58.0.2 (64 bits).
"Avast Web/Mail Shield Root" is correctly added to the certificate store but connections are not intercepted by Avast.
However, it works correctly in Edge. No problems with SSL scanning in Thunderbird either.

Exemple with the connection to https://forum.avast.com
Edge, avast certificate
Firefox, not the avast certificate
Edit: no answers, screenshots removed

I tried to reinstall (after using avastclear) but nothing changed.
My firefox installation is standard. I also have this issue with chrome, but it's the portableapps version so maybe it's not relevant.