When you visit a website in Mozilla Firefox, the Site Identity button (the padlock icon) appears in the address bar to the left of the web address. By clicking the padlock icon, you can verify if the website you are viewing is encrypted. In some cases, you may see the message Connection verified by a certificate issuer that is not recognized by Mozilla., even if the website is verified as secured.

In addition, your Firefox settings screen may show the message Your browser is being managed by your organization..

These messages are caused by the Web Shield feature, which is found in Avast One, Avast Free Antivirus, and Avast Premium Security. In order to scan encrypted web content, Avast needs to install its self-signed certificate, which results in these messages appearing in Mozilla Firefox.
- Avast One
- Avast Free Antivirus
- Avast Premium Security
- Windows
Updated on: 05/03/2025