Avast Online Security Settings don't work properly

[REDACTED]

Hi, in my Windows 10 Home x64 and Firefox Avast Online Security Settings don't work properly.
When I mark all settings "Do not track", that I mean:
- Block social networks by default
- Block ad tracking by default
- Block web analytics default
- Block other by default
and I save these setting, Avast Online Security don't save them permamently.
After restart my Firefox these settings are unmarked.
Why can I set them marked permamently?
Regards, Ann

[DavidR]

Do you cull cookie settings when you close firefox ?

If so this could be killing the settings.  I can't say for certain as I have long ago stopped using the AOS plugin for firefox, so I can't test this.