Hello! This is probably one of those intrusive facebook things I won't be able to stop, but when I open messenger in Firefox, it prompts me every! single! time! to download messenger for windows, which I very much don't want to do. It does it via a box over my messages that I have to physically click away. I already have pop-up windows disabled for every site. I went to permissions-- notifications but it wouldn't let me add messenger. Is there anything I can do?

Thank you!