I recently got a pop up in Firefox doing exactly that. I was messing around with my homelab and entered a URL/Port that Firefox deemed suspicious and warned me that “this port is usually not used for web browsing. Are you sure you want to visit that?”
I'm hearing more and more nice things about firefox lately. Been on chrome for the last 10 years or so but I might have to switch soon if they break extensions the way the plan to.
