When video-chatting with firefox-wayland using bluejeans, the small status window with the globe + cam + mic icons is shown as a normal window with standard window decorations and placed somewhere on the desktop.
With firefox-x11 instead it is a borderless window which is drawn centered at the top of the primary monitor. I would expect the same behavior when running firefox-wayland.
I can see this too. It's been the same way for a while. Nightly 68.0a1 (2019-05-06) (64-bit).
FWIW this is still happening with the official firefox 68 release. I think it might be best to just disable the whole mini status window thingie when using Wayland, IMHO it does not add much anyways.