Yes we have released the fix already (last week). Make sure you have latest version of the extension and please activate it again.
Making sure add-on is up to date:

  • in Firefox go to about:addons
  • Pick Avast Passwords
  • On details page expand dropdown from cog wheel in top right area
  • And choose Check for Updates option

Activate extension:
You can either do it from popup we show once you start Firefox and we detect that extension doesn’t communicate with us
Or you can go to Avast->Settings->Passwords and hit install in browser integration section.