I’m sorry, i forget it. This is guidance from avast technical support:

  1. Click the orange avast’s icon in system tray to open the program interface
  2. Click the REALTIME SHIELDS button
  3. Click the WEB SHIELD to select it and then click the EXPERT SETTINGS button in right pane
  4. Under MAIN SETTINGS, tick the “Scan traffic from well-known browser processes only”
  5. Confirm the change with OK button