Guys, please, please make copy-paste in Firefox reliable on macOS. That's worth much more to me than more performance, because I find the performance quite good

Guys, please, please make copy-paste in Firefox reliable on macOS. That's worth much more to me than more performance, because I find the performance quite good already! It's so frustrating to CUT (or copy) something in Firefox and then paste only to find the previous data still on the clipboard. It's been like this for ten years now, and it's still broken a good 20% of the time. It's only Firefox that I have this problem in, and it happens irrespective of profile or machine (I have many).