Sometimes you lose track of a bubble. Usually you remember a person who is part of the bubble. It would be useful to be able to click on a contact and see what bubbles you are both members of.
Rainbow has changed the way it deals with full size browser windows on Firefox and Chrome. Both of these browsers have full screen options invoked by pressing F11. That is a full screen application...
It would be nice to be able to "tag" a Rainbow contact that is busy/unavailable/DND so that you get a notification when the contact becomes "Online".