All of your cards should ping a notification for any transaction made using them in realtime, this includes physical card use. If they don't then set up your wallet on the phone or bank app to do this.
The perps just used another verification method for that transaction as they leafed your CC details some way at some point, probably from a store backend breach or some such.
As for the Firefox comment someone else made, nonsense. open source can be more secure, major exploits get seen to rather quickly. I think that IT team is full of boomers who haven't left the year 2003 or zoomers who joined under the boomer eye.