If you aren’t trying to connect then that would be suspect.
A screenshot of the Avast Alert with the ‘See details’ option selected, that may provide some more information
- Try running your browser with add-ons disabled.
- If that resolves it, have you added or updated any add-ons ?
- If so try disabling that add-on - and restart and try again.
If still not resolved and you are using Chrome based browser - try this suggestion by Avast Team member ‘lukor’ - What about page notifications? Here: chrome://settings/content/notifications ? Do you have all cleared?