They implemented the workaround on all of their web apps, probably poorly tested. But it does make sense after all. It is annoying but it works everywhere. We Firefox users are a minority, and they have little incentive to spend resources on us.
Anyways, imho this issue in particular should be fixed by Mozilla. Microsoft can implement workarounds, but I think the real solution is implementing JavaScript clipboard access API. Firefox can show the usual “This website is trying to access your clipboard. [Allow] [Reject] [Always reject]” message, and I would say that would be safe enough.
















Ah, that makes sense too. I just wanted to add my two cents as a software developer. Could be either database rows or graphical rows, I guess.