System Handler

I am using Lubuntu 22.04 Jammy Jellyfish. When I click on to a link, it goes to a box that says "Allow xxx to open the dmanager link with System Handler?" instead of going to the desired web page, like it used to do. When I click "Open Link" in this box, nothing happens, and the System Handler does not work. Is there any way I can make this go away, or delete System Handler, and go back to the way it was?