dbFront is a responsive web application which means that it will adjust its layout automatically based on the display dimensions and data. dbFront naturally creates many form and table fields that are used for editing and search.
The LastPass browser extension makes changes to these form and table fields that can trigger event loops causing performance issues. That is the source of the error message.
It is possible to disable LastPass for specific domains but that solution is not ideal.
We will be making changes to dbFront to block LastPass where appropriate.