I really like the concept of bringing i3-style tiling management to the browser space, but why is it specific to messengers? Since most well-designed websites work at any size, couldn't you just have a permanent tab at the side of the screen of, say, twitter, or some browser-based IRC client? Admittedly, I'd probably use facebook messenger as this tab anyway, so my needs are covered, but it seems like a missed opportunity. Obviously more technically-inclined individuals on more technically-inclined OS's have this already with proper tiling window managers but Windows and MacOS users probably don't want that system-wide and the browser would be the perfect place to introduce it.