We are sorry to know that and would like to get more information on this matter. Are you using the AVG Antivirus free or paid version of AVG Internet Security? If it is the free version, open the program interface and click on "Menu-->About". Take a screenshot of that window and share it here. You can post the screenshot here in your topic. Click on 'Answer' & then click on the 'Image' [mountain symbol] & follow the instructions. Thank you.
Thank you for updating the status. Yes, we could see the information the forum link that you have provided. We request you to disable AVG protection completely as mentioned in this article and see whether the issue with Firefox gets resolved. Keep us posted.
Thank you for the clarification. In this case, we have to analyze the logs and identify the root cause of this issue. Hence, an email instruction has been sent which will help you to send us the AVG logs. Once we receive it, will escalate and proceed with the investigation.