Avast passwords stopped working ~10 days ago

Hello,
For an unknowned reason, passwords does not work anymore.
Of course, I erased the program, then downloaded it again, but nothing changes:

  • the key is in my bar (firefox) but is no longer clickable,
  • my passwords are still in the console and I still can access a site through the console (confidentiality > passwords > account > webaddress > click) but it is not convenient,
  • no new password can be registered.

Does anyone know if the reason could be that Avast stopped serving firefox 52.9.0 (32 bits) on Vista ?
Thanks in advance.
Daniel

I have exactly the same problem (using Firefox 52.9.0 on Vista).
Have you found any solution?
Did you enquire Avast helpdesk?