Scenario 1: Install Kaspersky with Firefox closed We’ve managed to reproduce this issue using the following scenarios: It appears that all websites are affected by this. It’s worth mentioning that Kaspersky Free Edition AV comes with the Kaspersky Protection extension which somehow triggered this issue. It seems that there are no different behaviors when installing Firefox first, then the AV or viceversa. The same behaviour can be observed on older Firefox release builds all the way back to 47.0.2 (20161031133903). “Your connection is not secure” error message is displayed: Install the free Kaspersky antivirus from
